A water approach protection system and its construction method

Abstract

The present invention relates to a protection system for advancing into water. It includes multiple layers of fan-shaped self-locking block flexible protection belts. The self-locking block flexible protection belt includes multiple groups of steel pipe piles arranged in a fan shape. Protection locking blocks are installed on each group of steel pipe piles and the protection locking blocks sink underwater along the steel pipe piles where they are located. The adjacent protection locking blocks are fitted and connected. Sand and gravel materials are filled in the rear space of each layer of the self-locking block flexible protection belt to form an advancing body. The present invention also relates to a construction method, which includes the following steps: Step S1, preparation before construction; Step S2, positioning and anchoring of the construction ship; Step S3, driving of steel pipe piles; Step S4, installation of protection locking blocks; Step S5, throwing and filling of sand and gravel materials for advancing; Step S6, layered backward construction. The advancing protection system of the present invention has the characteristics of prefabricated construction, can be quickly constructed in water bodies to meet requirements such as river emergency rescue, has stronger resistance to water flow scouring, has all-terrain adaptability and higher dynamic stability.

Description

Technical Field

[0001] The present invention belongs to the technical field of underwater approach construction, and particularly relates to an underwater approach protection system and a construction method thereof. Background Art

[0002] The plugging of river levee breaches, the reinforcement of weak riverbanks, the protection of beach shores, and the restoration of the river flood passage section are important river safety improvement projects. Taking the plugging of levee breaches as an example: when a levee breach occurs, a large amount of land is flooded and buildings are washed away, causing huge losses to the lives and property of local people. Facing the severe emergency rescue situation of rapid flow and large impact force at the breach, restricted by conditions such as a small working surface, inconvenient transportation, and a long rescue distance, the rescue investment is large and the efficiency is not high. The above-mentioned projects take the construction of an approach protection system in water bodies as the basic content, and by reasonably constructing the approach protection system, the purposes of plugging breaches, reinforcing riverbanks and beach shores, and restoring the river flood passage section are achieved. On the other hand, in order to prevent or weaken the scouring effect of the river on the river channel, building spur dikes orthogonal or oblique to the riverbank in the river channel is also an important river regulation project, and the spur dikes in this scenario are also an important underwater approach protection system.

[0003] In the prior art, the "redundant configuration and extreme operation" emergency rescue construction technology is usually adopted to ensure the construction intensity and construction efficiency. For land rescue machinery, excavators and loaders are mostly used for loading materials, dump trucks are used for transporting materials, and bulldozers are used for spreading and filling materials. As an underwater rescue machine, rescue boats are usually used in transportation, towing, anchoring, and auxiliary rescue operations. In terms of specific projects: in the emergency rescue of the Yigong landslide dam lake in 2000, reinforced gabions were first used to protect the diversion channel, but it was washed out after the flow rate at the breach began to increase rapidly. Chen Xiaoqing et al. proposed a tetrahedral artificial structure for controlling the peak flood of dam break and carried out relevant experimental studies. Cai Yaojun, Zhou Zhao et al. first proposed the dam break control technical route of "controlling later rather than earlier and being flexible and adaptive", developed the dam break control technology of hanging wall gabion strings for slope protection and flexible net chains for bottom protection. Indoor and field tests showed that the peak flood reduction rate reached 20%, achieving a breakthrough in dam break control technology. However, the above technologies are all pre-protections on existing structures and cannot perform dynamic protection according to the rescue progress, with poor adaptability.

[0004] In summary, it is necessary to develop and design an underwater approach protection system and a construction method thereof to solve the drawbacks of the prior art. Summary of the Invention

[0005] The purpose of the present invention is to provide an underwater approach protection system, which has the characteristics of prefabricated construction, can be quickly constructed in water bodies to meet requirements such as river emergency rescue, has stronger resistance to water flow scouring, and has higher dynamic stability.

[0006] The technical solution adopted by the present invention is as follows: A water approach protection system includes multiple layers of fan-shaped self-locking block flexible protection belts. Each self-locking block flexible protection belt is stacked layer by layer to form a stepped structure. The bottom layer of the self-locking block flexible protection belt is located on the bottom mud surface of the water, and the top of the top layer of the self-locking block flexible protection belt is exposed above the water surface. The front bottom of the upper layer of the self-locking block flexible protection belt presses on the rear top of the lower layer of the self-locking block flexible protection belt and forms an overlapping area; the self-locking block flexible protection belt includes multiple groups of steel pipe piles arranged in a fan shape. Protection locking blocks are installed on each group of steel pipe piles, and the protection locking blocks sink underwater along the steel pipe piles where they are located. The adjacent protection locking blocks are fitted and connected. Sand and gravel are filled in the rear space of each layer of the self-locking block flexible protection belt to form an approach body.

[0007] Preferably, two longitudinally penetrating installation holes are provided on the protection locking block. The number of steel pipe piles corresponding to each protection locking block is two, and the two steel pipe piles are respectively located in the two installation holes of the protection locking block.

[0008] Preferably, the protection locking block is a hollow high-strength plastic locking block. A filling hole for injecting filler into the inner cavity is provided at the top of the protection locking block, and a sealing buckle cover is provided on the filling hole.

[0009] Preferably, the width of the overlapping area is equal to 15% - 30% of the width of the protection locking block.

[0010] Preferably, the lower end of the steel pipe pile penetrates through the unstable soil layer on the bottom mud surface and is driven into the bearing layer. The depth of driving into the bearing layer is equal to 1 / 3 - 1 / 2 of the pile length of the steel pipe pile.

[0011] Preferably, the water approach protection system is a spur dike, which is orthogonal or oblique to the river bank and extends into the river channel, or the water approach protection system is located inside the breach on the river bank and closes the breach.

[0012] Another object of the present invention is to provide a construction method for a water approach protection system.

[0013] The technical solution adopted by the present invention is as follows: A construction method for a water approach protection system, based on an amphibious rescue ship, includes the following steps.

[0014] Step S1, preparation before construction, survey the river channel topography, water depth, flow velocity and geological conditions, determine the pile position layout parameters of the approach protection system, check the stability of the construction area and remove obstacles to ensure that the construction ship can dock safely;

[0015] Step S2, construction ship positioning and anchoring, the amphibious rescue ship sails to the designated construction area, starts the autonomous anchoring system to fix the hull, and uses the positioning pile trolley of the construction ship to adjust the hull levelness;

[0016] Step S3, steel pipe pile driving, using the GPS system and underwater depth sounder carried by the amphibious rescue ship to confirm the pile position coordinates and depth, using the pile positioning trolley of the construction ship to adjust the hull posture to ensure the verticality of the pile, and using the pile driving device of the construction ship to drive the steel pipe pile according to the pile spacing and burial depth required by the design;

[0017] Step S4, installing the protective lock block, installing the protective lock block on the injected steel pipe pile, injecting filler into the protective lock block and sealing it, the protective lock block naturally sinks along the steel pipe pile where it is located by gravity, and the completely sunken protective lock blocks are sequentially connected and embedded underwater to form a self-embedded flexible protection belt as a continuous anti-collision barrier;

[0018] Step S5, filling sand and gravel into the occupied area. Sand and gravel are filled behind the formed self-interlocking block flexible protection belt to form an occupied layer. The filling order is gradually filled from the outside to the center of the river channel. The sand and gravel layer after filling is compacted to ensure the density of the occupied layer.

[0019] Step S6, layered retreat construction, after completing the construction of the first layer, the amphibious rescue ship is retreated and moved, and steps S2 to S5 are repeated to complete the construction of the upper layers until the top elevation of the uppermost occupation layer exceeds the water surface height. Each occupation layer constitutes an occupation body, and each interlocking block flexible protection belt and the occupation body constitute an underwater occupation protection system.

[0020] Preferably, in step S2, the horizontality of the amphibious rescue ship is controlled within 5 mm; in step S3, the verticality of the steel pipe pile is re-measured every 2 m depth to ensure that the inclination rate is <1% and the deviation between the injection position of the steel pipe pile and the designed pile position is <10 cm; in step S4, the filler injected into the protective lock block is gravel and / or water, and the density of the filled protective lock block is >1200 kg / m 3 .

[0021] The advantages and positive effects of the present invention are:

[0022] The present invention provides a water approach protection system. A multi-layer self-locking block flexible protection belt forms an anti-scour barrier. The anti-scour barrier withstands the impact of water flow and can thus be further tightened to form a stable structure. The anti-scour barrier can better resist the scouring effect of water flow. Therefore, the constructed water approach protection system has strong overall stability and is not easily collapsed. The self-locking block flexible protection belt is composed of multiple sequentially fitted protection lock blocks and uses steel pipe piles as the skeleton. Therefore, this water approach protection system has the structural characteristics of being assembled and can be quickly constructed on-site to meet requirements such as river emergency rescue. On the other hand, when this water approach protection system encounters the problem of river bottom scouring, the overall structure will also drop accordingly, and there will be no problem of the overall collapse of the masonry structure approach system due to local settlement. Therefore, it has higher dynamic stability in water bodies. The steel pipe piles and protection lock blocks of this water approach protection system can also be disassembled, recycled, and reused, reducing waste of resources.

[0023] The construction method of the present invention is based on an amphibious rescue ship, giving full play to the characteristics of the amphibious rescue ship being flexible in movement and rich in configurations (including a positioning system, an anchoring system, a piling device, etc.). Therefore, it has all-terrain adaptability. By giving play to the amphibious mobility ability of the amphibious rescue ship, no external lifting equipment is required, and it is suitable for construction in narrow waters and under complex traffic conditions. The adopted layered step-back construction process has the following advantages: 1. Implementing in layers can avoid excessive overall stress on the structure of the approach system and reduce the risk of being washed out during construction; 2. Under the condition of the bottom bearing capacity, the higher the approach system, the greater the upper moment. Starting from the bottom layer by layer to construct can greatly reduce the construction difficulty; 3. The flexible anti-scour barrier can better adapt to the underwater terrain, effectively achieve airtightness, and reduce the flow rate; 4. The layer-by-layer stacking process can effectively increase the weight of the bottom protection body, thereby improving the compactness of the contact surface and reducing water flow scouring; 5. The step-back layer pile structure can effectively improve the overall stress of the approach protection system, improve the stress uniformity and self-stability of the protection body, and avoid the collapse and breach of the approach system caused by excessive local stress; 6. The layered step-back flexible lock block protection body slope structure can effectively reduce the shear force of the bearing pile and avoid the instability situation of the vertical protection structure due to excessive passive earth pressure. Brief Description of the Drawings

[0024] Figure 1 is a top view structural schematic diagram of the approach protection system of the present invention, that is, a floor plan;

[0025] Figure 2 is a cross-sectional structural schematic diagram of the approach protection system of the present invention;

[0026] Figure 3 is Figure 1 a top view structural schematic diagram of the protection lock block in

[0027] Figure 4It is a top - view structural schematic diagram when the approach protection system is in the form of a spur dike;

[0028] Figure 5 It is a top - view structural schematic diagram when the approach protection system is used to block a breach.

[0029] In the figure:

[0030] 1. Steel pipe pile; 2. Protection locking block; 3. Approach body; 4. Overlap area; 5. Riverbank; 6. Breach. Specific implementation manner

[0031] To further understand the content, characteristics and efficacy of the present invention, the following examples are given for detailed description.

[0032] Please refer to Figure 1 and Figure 2 The in - water approach protection system of the present invention includes multiple layers of fan - shaped ring - shaped self - locking block flexible protection belts. Each self - locking block flexible protection belt is stacked layer by layer to form a stepped structure. The lowermost self - locking block flexible protection belt is located on the bottom mud surface of the water, and the top of the uppermost self - locking block flexible protection belt is exposed above the water surface. The front bottom of the upper - layer self - locking block flexible protection belt presses on the rear top of the lower - layer self - locking block flexible protection belt and forms an overlap area 4. Sand and gravel materials are filled in the rear space of each layer of self - locking block flexible protection belts to form an approach body 3. The front stepped - arranged self - locking block flexible protection belts together constitute an erosion - prevention barrier for the approach body 3. The water flow scouring action is mainly applied to the erosion - prevention barrier. In this way, the in - water approach protection system has stronger resistance to water flow scouring and is not easily collapsed after construction.

[0033] The self - locking block flexible protection belt includes multiple groups of steel pipe piles 1 arranged in a fan - shaped ring. Protection locking blocks 2 are installed on each group of steel pipe piles 1 and the protection locking blocks 2 sink underwater along the steel pipe piles 1 where they are located. The adjacent protection locking blocks 2 are fitted and connected. The driven steel pipe piles 1 serve as the framework of the self - locking block flexible protection belt. The protection locking blocks 2 of the self - locking block flexible protection belt located underwater tend to gather towards the center under the action of water flow pressure, so that the self - locking block flexible protection belt can be made more dense and the structural strength can be improved. The steel pipe piles 1 are made of Q235B steel, and the length is customized according to the designed water depth, generally 8 - 15m.

[0034] Figure 3A typical structural style of the protective lock block 2 is given in [reference], and it can be seen that: the protective lock block 2 is in a Z shape. When sequentially spliced and fitted to form a fan-shaped self-embedded lock block flexible protective belt, the front part of the latter protective lock block 2 overlaps the rear part of the previous protective lock block 2, forming an embedded connection relationship. Since the adjacent protective lock blocks 2 in the circumferential direction are not in a rigid fixed relationship, the "self-embedded lock block flexible protective belt" is called flexible, and the impact-resistant barrier composed of multiple layers of self-embedded lock block flexible protective belts in a stepped shape is also flexible. Since the protective lock block 2 is prefabricated and installed layer by layer on site, the water approach protection system of the present invention has an assembled structural characteristic, which can shorten the construction period.

[0035] There are two longitudinally penetrating installation holes provided on the protective lock block 2. The number of steel pipe piles 1 corresponding to each protective lock block 2 is two, and the two steel pipe piles 1 are respectively located in the two installation holes of the protective lock block 2. Therefore, the steel pipe piles 1 are used as the support and guide for the protective lock block 2. When pre-driving the steel pipe piles 1, it is necessary to ensure the position accuracy. After installing the protective lock block 2 on the steel pipe piles 1, a self-embedded lock block flexible protective belt is formed.

[0036] In this embodiment, the protective lock block 2 is a hollow high-strength plastic lock block (high-strength polyethylene PE or polypropylene PP or ASA / PC material). A filling hole for injecting filler into the inner cavity is provided at the top of the protective lock block 2, and a sealing buckle cover is provided on the filling hole. The hollow and plastic protective lock block 2 is easy to be prefabricated and can reduce the processing and transportation costs of consumables. By filling the inside with filler, the specific gravity of the protective lock block 2 is increased, so that the protective lock block 2 can sink smoothly in the water body and resist floating. Of course, it can be imagined that the protective lock block 2 can also be a precast concrete lock block. At this time, the aforementioned self-embedded lock block flexible protective belt is formed by the concrete lock blocks that sink along the steel pipe piles 1 to underwater.

[0037] In this embodiment, the width of the overlapping area 4 is 15% - 30% of the width of the protective lock block 2. By pressing the protective lock block 2 of the upper layer of self-embedded lock block flexible protective belt on the protective lock block 2 of the lower layer of self-embedded lock block flexible protective belt, the overall structural stability of the water approach protection system of the present invention can be improved.

[0038] In this embodiment, the lower end of the steel pipe pile 1 penetrates through the unstable soil layer at the bottom of the water surface and is driven into the bearing layer. The depth of driving into the bearing layer is 1 / 3 - 1 / 2 of the pile length of the steel pipe pile 1. In this way, the lower part of the steel pipe pile 1 can have a stable bonding relationship with the bearing layer at the bottom of the water surface. Therefore, during the existence period after the construction of the water approach protection system of the present invention, the instability problem will not occur due to the loss of the anchoring effect of the steel pipe pile 1.

[0039] Figure 4 and Figure 5Two typical styles of the in-water approach protection system are given, which are respectively applied to different scenarios:

[0040] Please refer to Figure 4 , the in-water approach protection system is a spur dike, which is orthogonal or oblique to the riverbank 5 ( Figure 4 as shown in Figure 4 is an oblique intersection) and extends into the river channel. A spur dike, also known as a "flow-deflecting dike", is a river regulation structure that is orthogonal or oblique to the riverbank 5 and extends into the river channel. Spur dikes are divided into long and short ones. The long ones deflect the flow dynamic axis and tend to the opposite bank, playing a role in deflecting the flow. The short ones play a role in locally adjusting the flow to protect the riverbank. The revetment project composed of spur dikes can control the flow trend, protect the embankment, and also have the functions of narrowing the riverbed, blocking the fork, and silting the beach bank. As

[0041] Please refer to Figure 5 , the in-water approach protection system is located inside the breach 6 on the riverbank 5 and closes the breach 6. In the flood fighting and rescue application scenario where a breach 6 occurs on the riverbank and needs to be blocked, the in-water approach protection system is constructed inside the breach to block the breach.

[0042] The construction method for constructing the aforementioned in-water approach protection system is based on an amphibious rescue ship. The amphibious rescue ship is an existing facility, and the ship itself has the ability to move on land and water. It is equipped with a positioning system (GPS), an underwater monitoring system, an anchoring system, a piling device (pile tongs, pile hammers, etc.). The auxiliary devices include a positioning pile trolley, a lock block installation device (lock block clamp and robotic arm), and a water injection / filling system. This construction method gives full play to the characteristics of the amphibious rescue ship.

[0043] Traditional ships are difficult to load and unload, and need to be equipped with large-scale lifting equipment and special large-scale transport vehicles, and have high requirements for lifting sites. However, amphibious rescue ships have the functions of autonomous launching and landing, self-loading and self-unloading, self-anchoring, and self-navigation. They can operate amphibiously in all operation modes, and do not require large-scale lifting equipment for loading and unloading. If the site is small and the traffic conditions are poor, it can automatically move to a wide area without having to consider problems such as running aground due to shallow water or mudflats. It has strong mobility, convenience and flexibility, and has unique mobility both on land and water. In particular, river embankment flood control and rescue are characterized by long flood control dam lines, complex transportation conditions, and limited rescue operation sites. It is particularly suitable to use amphibious rescue ships with strong applicability, strong mobility, and powerful functions for rescue. Traditional ship anchoring usually uses anchor cables to anchor on the shore or in the water. Amphibious rescue ships use an autonomous anchoring system. Operational shifting does not require auxiliary ships, winches or cables. It is automatically stabilized by two front stabilizers and two tiltable rear stabilizers. The rescue ship equipped with a positioning pile trolley can also be moved forward, backward, left and right by the trolley, reducing the number of times the anchor is moved continuously, effectively shortening the construction time.

[0044] The construction method of the water intrusion protection system includes the following steps:

[0045] Step S1, preparation before construction, surveying and mapping the river terrain, water depth, flow velocity and geological conditions, determining the pile layout parameters of the entry protection system, checking the stability of the construction area and clearing obstacles to ensure that the construction ship can dock safely.

[0046] Step S2, the construction ship is positioned and anchored. The amphibious rescue ship sails to the designated construction area, starts the autonomous anchoring system to fix the hull, and uses the positioning pile trolley of the construction ship to adjust the level of the hull;

[0047] In this step, the hull levelness of the amphibious rescue ship is controlled within 5 mm.

[0048] Step S3, steel pipe piles 1 are driven, using the GPS system and underwater depth sounder carried by the amphibious rescue ship to confirm the pile position coordinates and depth, using the pile positioning trolley of the construction ship to adjust the hull posture to ensure the verticality of the pile, and using the pile driving device of the construction ship to drive the steel pipe piles 1 according to the pile spacing and burial depth required by the design;

[0049] In this step, the verticality of the steel pipe pile 1 is remeasured every time the steel pipe pile 1 is driven at a depth of 2 m to ensure that the inclination rate is less than 1% and the deviation value between the driving position of the steel pipe pile 1 and the designed pile position is less than 10 cm.

[0050] Step S4: Install the protective lock block 2. Install the protective lock block 2 on the steel pipe pile 1 after driving. Inject filler into the protective lock block 2 and seal it. The protective lock block 2 sinks naturally along the steel pipe pile 1 where it is located by gravity. The completely settled protective lock blocks 2 are sequentially fitted and connected underwater to form a self-embedded lock block flexible protective belt, serving as a continuous anti-scour barrier.

[0051] In this step, the protective lock block 2 can be self-carried by an amphibious rescue boat or transported to the side of the construction boat by a flatbed trailer. In this step, the filler injected into the protective lock block 2 is gravel (sand and gravel with a particle size of 5 - 20 cm) and / or water. After filling, the density of the protective lock block 2 > 1200 kg / m 3 .

[0052] Step S5: Backfill and advance with sand and gravel. Backfill sand and gravel behind the formed self-embedded lock block flexible protective belt to form an advancing layer. The backfilling sequence is gradually from the outside to the center of the river channel. Compact the backfilled sand and gravel layer to ensure the density of the advancing layer.

[0053] In this step, a backhoe or a cutter suction dredger is used to backfill graded sand and gravel behind the self-embedded lock block flexible protective belt.

[0054] Step S6: Layered backward construction. After completing the construction of the first layer, move the amphibious rescue boat backward. Repeat steps S2 to S5 to complete the construction of the upper layers until the top elevation of the uppermost advancing layer exceeds the water surface height. Each advancing layer forms an advancing body 3, and the self-embedded lock block flexible protective belt and the advancing body 3 together form an underwater advancing protection system.

[0055] In this step, "moving the boat backward" means moving the position of the boat towards the direction of the riverbank 5. The top elevation of the uppermost advancing layer exceeding the water surface height can be 1 m.

Claims

1. An underwater intrusion protection system, characterized by: The invention comprises a plurality of fan-shaped self-interlocking block flexible protection belts, wherein the respective interlocking block flexible protection belts are stacked layer by layer to form a stepped structure, wherein the bottom layer of the self-interlocking block flexible protection belt is located on the mud surface of the bottom of the water, and the top layer of the self-interlocking block flexible protection belt is exposed from the water surface, and the front bottom of the upper layer of the self-interlocking block flexible protection belt is pressed on the rear top of the lower layer of the self-interlocking block flexible protection belt to form an overlapping area (4); the self-interlocking block flexible protection belt comprises a plurality of groups of steel pipe piles (1) arranged in a fan-shaped ring, wherein a protective locking block (2) is installed on each group of steel pipe piles (1) and the protective locking block (2) is sunk underwater along the steel pipe piles (1) where it is located, and adjacent protective locking blocks (2) are interlocked and connected, and the rear space of each layer of the self-interlocking block flexible protection belt is filled with sand and gravel to form an entry body (3), and the respective interlocking block flexible protection belts arranged in a stepped shape in front together form an anti-collision barrier of the entry body (3); The protective locking block (2) is in a Z-shape, and when the protective locking block (2) is sequentially spliced ​​and interlocked to form a fan-shaped self-interlocking block flexible protective belt, the front part of the rear protective locking block (2) overlaps the rear part of the front protective locking block (2) to form an interlocking connection relationship; Two longitudinally penetrating mounting holes are provided on the protection locking block (2); the number of steel pipe piles (1) corresponding to each protection locking block (2) is two, and the two steel pipe piles (1) are respectively located in the two mounting holes of the protection locking block (2); The protective lock block (2) is a hollow high-strength plastic lock block, a filling hole for injecting a filler into the inner cavity is provided at the top of the protective lock block (2), and a sealing buckle cover is provided on the filling hole; The width of the overlapping area (4) is equal to 15-30% of the width of the protective lock block (2); The lower end of the steel pipe pile (1) passes through the unstable soil layer on the bottom mud surface and is driven into the bearing layer, and the depth of the driving into the bearing layer is equal to 1 / 3 to 1 / 2 of the pile length of the steel pipe pile (1); The underwater intrusion protection system is a spur dike, which is perpendicular or oblique to the river bank (5) and extends into the river channel, or the underwater intrusion protection system is located on the inner side of the breach (6) on the river bank (5) and closes the breach (6).

2. The construction method of the underwater intrusion protection system according to claim 1 is characterized by: Based on the amphibious rescue ship, the following steps are included: Step S1, preparation before construction, mapping the river terrain, water depth, flow velocity and geological conditions, determining the pile layout parameters of the occupation protection system, checking the stability of the construction area and clearing obstacles to ensure that the construction ship can dock safely; Step S2, the construction ship is positioned and anchored. The amphibious rescue ship sails to the designated construction area, starts the autonomous anchoring system to fix the hull, and uses the positioning pile trolley of the construction ship to adjust the level of the hull; Step S3, steel pipe piles (1) are driven, using the GPS system and underwater depth sounder carried by the amphibious rescue ship to confirm the pile position coordinates and depth, using the pile positioning trolley of the construction ship to adjust the ship's posture to ensure the verticality of the piles, and using the pile driving device of the construction ship to drive the steel pipe piles (1) according to the pile spacing and burial depth required by the design; Step S4, installing the protective locking block (2), installing the protective locking block (2) on the injected steel pipe pile (1), injecting filler into the protective locking block (2) and sealing it, so that the protective locking block (2) naturally sinks along the steel pipe pile (1) where it is located by gravity, and the completely sunken protective locking blocks (2) are sequentially connected and embedded underwater to form a self-embedded flexible protection belt as a continuous anti-collision barrier; Step S5, filling sand and gravel into the occupied area. Sand and gravel are filled behind the formed self-interlocking block flexible protection belt to form an occupied layer. The filling order is gradually filled from the outside to the center of the river channel. The sand and gravel layer after filling is compacted to ensure the density of the occupied layer. Step S6, layered retreat construction, after completing the construction of the first layer, the amphibious rescue ship is retreated and moved, and steps S2 to S5 are repeated to complete the construction of the upper layers until the top elevation of the uppermost entry layer exceeds the water surface height, and each entry layer constitutes an entry body (3), and each interlocking block flexible protection belt and the entry body constitute an underwater entry protection system.

3. The construction method according to claim 2, characterized in that: step S2 In step S3, the horizontality of the amphibious rescue ship is controlled within 5 mm; in step S4, the verticality of the steel pipe pile (1) is re-measured every time the steel pipe pile (1) is driven at a depth of 2 m, ensuring that the inclination rate is less than 1%, and the deviation between the driven position of the steel pipe pile (1) and the designed pile position is less than 10 cm; in step S5, the filler injected into the protective lock block (2) is gravel and / or water, and the density of the filled protective lock block (2) is greater than 1200 kg / m 3 .

Images