Caisson dry dock structure and construction method

Abstract

The invention discloses a caisson dry dock structure and a construction method, and relates to the related field of caisson dry docks, the caisson dry dock structure comprises a caisson dry dock structure main body and a drainage system arranged on one side of the caisson dry dock structure main body, the caisson dry dock structure main body comprises a caisson dry dock wall body poured on a foundation, and a dock gate is arranged on one side of the caisson dry dock wall body in a lifting mode; the drainage system comprises a water storage part fixedly installed on the top of the dry dock chamber, the top of the water storage part is connected with a sewer pipe through a conveying pump, and a plurality of sets of water suction pipes are arranged on the outer side of the upper end of the water storage part and used for absorbing and discharging water seepage in the dry dock chamber. According to the caisson dry dock structure and the construction method, the caisson dry dock wall body and the dry dock chamber form a stable main body, the dock gate, the crawling frame and the lifting piece meet the construction requirement, the 1-degree to 2-degree inclined top face of the dry dock chamber is matched with the water accumulation ditch to achieve efficient water collection, the sand layer and the geomembrane layer achieve the dual-enhanced anti-seepage effect, the water seepage and sand carrying amount is reduced, and the overall structure stability is high.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of caisson dry dock, in particular to a caisson dry dock structure and construction method. BACKGROUND

[0002] As the core foundation component of port terminals, cross-sea bridges and underwater tunnels, the prefabrication of caissons needs to rely on dry docks to provide a dry and stable construction environment, so the rationality of the structure and the construction efficiency of the caisson dry dock directly determine the quality and duration of the project.

[0003] The existing caisson has many mutually matched settings inside during manufacturing, which causes certain deficiencies during later manufacturing. To solve the above problems, reference can be made to the ship dock and construction technology for building prefabricated caisson devices disclosed in the prior art (Chinese patent with application number CN201210362367.9 and application date September 14, 2012), because the liftable floating caisson type construction workbench in the ship dock does not need to have large buoyancy, and because of such a liftable floating caisson type construction workbench, it is directly placed in the ship dock basin for building prefabricated caisson devices, and various prefabricated caisson devices can gradually sink in seawater during the building process. Reference can also be made to the large deepwater caisson shallow ship dock semi-prefabrication construction method disclosed in the prior art (Chinese patent with application number CN202410902401.X and application date July 6, 2024), which can greatly reduce the excavation depth requirement of the dry dock, thereby reducing the construction quantity and cost of the dry dock. Reference can also be made to the double-direction water-stopping caisson gate structure disclosed in the prior art (Chinese patent with application number CN201510085221.8 and application date February 16, 2015), which can achieve the double-direction water-stopping purpose of preventing water from flowing in during dry dock construction and preventing water from flowing out during dry dock water storage.

[0004] Although the above technology can solve the problem of convenient manufacturing, for example, after manufacturing, a drainage system needs to be equipped inside to discharge the water permeated inside, but when the existing drainage system absorbs and discharges the water inside the caisson, some silt will exist inside, which can easily cause the drainage system to be blocked after a long time of discharge.

[0005] In view of this, a caisson dry dock structure and construction method are provided to solve the above problems. SUMMARY

[0006] The present application aims to provide a caisson dry dock structure and construction method to solve the above problems in the current market. After the caisson is manufactured, it needs to be equipped with a drainage system to discharge the water that has penetrated into the interior. However, the existing drainage system may cause blockage of the discharge system when absorbing and discharging water in the caisson.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A caisson dry dock structure includes a caisson dry dock structure body and a drainage system arranged on one side thereof. The caisson dry dock structure body includes a caisson dry dock wall body poured on a foundation. The inner side of the caisson dry dock wall body is a dry dock chamber. A dock gate is arranged on one side of the caisson dry dock wall body and is lifted. A crawling frame is fixedly installed on the inner side of the caisson dry dock wall body. The inner side center position of the dry dock chamber is a working area. The drainage system includes a water storage element fixedly installed on the top of the dry dock chamber. The water storage element is connected with a sewer pipe through a conveying pump. A plurality of groups of water suction pipes are arranged on the outer side of the upper end of the water storage element for absorbing and discharging the seepage water in the dry dock chamber.

[0009] Preferably, a sand layer is arranged on the upper side of the inner side of the dry dock chamber. A geomembrane layer is arranged on the top of the sand layer. The top surface of the dry dock chamber is arched upward. The working area is horizontally arranged. The inclination angle is 1° to 2°. A water accumulation ditch is arranged on the inner side edge of the dry dock chamber close to the water storage element. A lifting element is further installed on the side of the caisson dry dock wall body close to the dock gate.

[0010] Preferably, the inner side of the upper space of the water storage element is provided with a material collecting hopper. A filter cylinder is fixedly arranged on the lower end of the material collecting hopper. The bottom end of the filter cylinder is slidably inserted into the lower space of the water storage element. A sealing gasket is arranged on the sliding position of the lower end of the filter cylinder close to the partition plate.

[0011] Preferably, a fixed motor is fixedly arranged on one side of the lower space of the water storage element. The output end of the fixed motor is inserted into the conveying pipe. The output end of the fixed motor is fixedly arranged on one side of the conveying auger. The conveying pipe is arranged on one side of the water storage element.

[0012] Preferably, the output end of the fixed motor is connected with a transmission element through a bevel gear assembly. A rotating disc is fixedly arranged on the top of the transmission element. A protruding block is fixedly arranged on the outer side of the edge of the rotating disc. The outer side of the protruding block is attached to the outer side of the material collecting hopper. The top edge of the material collecting hopper is slidably arranged on the outer side of the guide rod.

[0013] Preferably, both ends of the guide rod are fixed to the inner wall of the water storage component, and a spring is provided on the outside of the guide rod. The bottom end of the spring abuts against the outside of the collecting screen hopper. The collecting screen hopper and the filter cylinder are integrated. The collecting screen hopper and the guide rod form an elastic lifting structure through the protrusion of the rotating disk.

[0014] Preferably, the upper outer side of the filter cylinder is provided with several sets of mesh holes, the lower end of the filter cylinder is completely sealed, and the lifting range of the filter cylinder does not exceed the contact position between the sealing gasket and the internal partition of the water storage component.

[0015] Preferably, the filter cylinder has a feeding groove inside, which is located in the lower sealed area of ​​the filter cylinder. A plug is fitted inside the feeding groove, and an elastic corrugated pipe is provided below the feeding groove. The bottom of the elastic corrugated pipe is fixed at the inlet position of the conveying pipe, and the bottom end of the plug is fixed inside the bottom end of the elastic corrugated pipe.

[0016] Preferably, the lower end of the drain pipe is connected to a first water-absorbing pipe and a second water-absorbing pipe via a T-junction. The first water-absorbing pipe extends into the upper space inside the water storage device, and the second water-absorbing pipe extends into the lower space inside the water storage device and is connected to the bottom side of the conveying pipe. A filter screen is provided at the position where the second water-absorbing pipe connects to the conveying pipe.

[0017] A construction method for a caisson dry dock, the specific method of which is as follows:

[0018] S1: Pour the dry dock wall of the caisson on the foundation to form the inner dry dock chamber, delineate the horizontal working area, and control the top surface of the dry dock chamber to arch upwards with an inclination angle of 1° to 2°; install a climbing frame inside the dry dock wall of the caisson, and install a lifting component near the dock door for hoisting cargo and raising and lowering the dock door.

[0019] S2: Lay a sand layer and a geomembrane layer in sequence on the upper side of the dry dock, and open a water collection ditch on the inner edge of the dry dock near the water storage device.

[0020] S3: Fix the water storage unit to the top of the dry dock chamber, install the water suction pipe, and connect the water storage unit to the water pipe through the conveying pump; install a partition inside the water storage unit to divide it into upper and lower spaces, install a material collection screen bucket in the upper space, fix a filter cylinder at its lower end and extend it into the lower space, and install a sealing gasket near the partition at the lower end of the filter cylinder.

[0021] S4: A fixed motor is installed in the space below the water storage component. Its output end extends into the conveying pipe and fixes the conveying auger. One side of the conveying pipe extends out of the water storage component. The fixed motor and the transmission component are connected by a bevel gear assembly. A rotating disk is installed on the top of the transmission component so that the protrusion fits against the collection screen hopper. A guide rod is installed on the inner wall of the water storage component and fitted with a spring, which passes through the collection screen hopper to form an elastic lifting structure.

[0022] S5: A material trough is opened in the sealing area at the lower end of the filter cartridge and a plug is installed. An elastic corrugated pipe is installed below to connect to the inlet of the conveying pipe. The bottom end of the plug is fixed inside the corrugated pipe.

[0023] S6: Connect the drain pipe to the first water intake pipe and the second water intake pipe using a T-connector. The first water intake pipe extends into the upper space of the water storage device, and the second water intake pipe extends into the lower space and connects to the delivery pipe. Install a filter screen at the connection point.

[0024] Compared with existing technologies, the beneficial effects of this invention are as follows: The caisson dry dock structure and construction method feature a stable main body formed by the dry dock walls and dry dock chamber; the dock gate, climbing frame, and lifting components are adapted to construction needs; the 1° to 2° inclined top surface of the dry dock chamber, combined with the water collection ditch, achieves efficient water collection; the sand layer and geomembrane layer provide double reinforcement for seepage prevention, reducing the amount of sand carried by seepage; and the overall structure has strong stability. The drainage system is innovatively upgraded, with a graded design for the upper and lower spaces of the water storage components; the aggregate sieve and filter cylinder achieve two-stage interception of sediment; the fixed motor-driven rotating disc, combined with guide rod springs, causes the aggregate sieve and filter cylinder to elastically lift and vibrate, preventing filter media clogging; the conveying auger efficiently discharges deposited sediment; and the dual water intake pipes combined with the filter screen achieve secondary interception, fundamentally solving the problem of easy clogging in traditional drainage systems. Specifically, as shown below:

[0025] 1. The conical top surface of the dry dock chamber, combined with the water collection ditch, can concentrate water collection. The sand layer and geomembrane layer further enhance the seepage prevention effect and reduce the amount of silt carried by seepage water. The graded filtration and sand discharge structure inside the water storage device can prevent silt from accumulating in the pipes, greatly reducing the maintenance frequency and cost of the drainage system. It is suitable for the long-term needs of the dry construction environment for caisson prefabrication and reduces project delays caused by blockage.

[0026] 2. In the drainage system, the rotating disc drives the aggregate screen bucket to lift and lower flexibly, and works in sync with the conveying auger to discharge sand, so as to achieve continuous and efficient sand filtration and discharge, avoid interruption of drainage due to blockage, and continuously provide a stable environment for caisson prefabrication, thus helping to improve project quality and progress. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 This is a side view of the structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the cross-sectional structure of the present invention;

[0030] Figure 4 For the present invention Figure 3 Enlarged structural diagram at point A in the middle;

[0031] Figure 5 This is a schematic diagram of the main cross-sectional structure of the water storage component of the present invention;

[0032] Figure 6 For the present invention Figure 5 Enlarged structural diagram at point B;

[0033] Figure 7 This is a top view of the material collection screen hopper structure of the present invention;

[0034] Figure 8 This is a schematic diagram of the main cross-sectional structure of the filter cartridge of the present invention;

[0035] Figure 9 This is a schematic diagram of the main cross-sectional structure of the delivery pipe of the present invention.

[0036] In the diagram: 1. Dry dock wall; 2. Dry dock chamber; 3. Lifting components; 4. Dock gate; 5. Climbing frame; 6. Working area; 7. Sand layer; 8. Geomembrane layer; 9. Drainage ditch; 10. Suction pipe; 11. Water storage device; 12. Drainage pipe; 121. First suction pipe; 122. Second suction pipe; 13. Aggregate sieve; 14. Filter cylinder; 141. Discharge chute; 142. Plug; 143. Elastic corrugated pipe; 15. Fixed motor; 16. Transmission components; 17. Rotating disc; 18. Guide rod; 19. Conveying pipe; 20. Conveying auger. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] Please see Figures 1-9 The present invention provides the following technical solution: a caisson dry dock structure.

[0039] Example 1: To address the issue that current caissons require internal drainage systems after manufacturing to remove infiltrated water, existing systems often contain sediment. Prolonged drainage can easily lead to blockages. (See attached...) Figure 3 and attached Figure 5 -Appendix Figure 9The system includes the main structure of the dry dock and the drainage system installed inside it. The drainage system includes a water storage unit 11 fixedly installed on the top of the dry dock chamber 2. The top of the water storage unit 11 is connected to the drain pipe 12 through a delivery pump. Several sets of suction pipes 10 are provided on the outer side of the upper end of the water storage unit 11. A fixed motor 15 is fixed on one side of the lower space of the water storage unit 11. The output end of the fixed motor 15 extends into the inside of the delivery pipe 19, and the output end of the fixed motor 15 is fixed on one side of the delivery auger 20. One side of the delivery pipe 19 extends out of the outside of the water storage unit 11. The output end of the fixed motor 15 is connected to the transmission component 16 via a bevel gear assembly. A rotating disk 17 is fixed to the top of the transmission component 16, and a protrusion is fixed to the outer edge of the rotating disk 17. The outer edge of the protrusion is attached to the outer side of the collecting hopper 13. The top edge of the collecting hopper 13 is slidably positioned on the outer side of the guide rod 18. Both ends of the guide rod 18 are fixed to the inner wall of the water storage component 11. A spring is provided on the outer side of the guide rod 18, with the bottom end of the spring abutting against the outer side of the collecting hopper 13. The collecting hopper 13 and the filter cylinder 14 are integrated into a single unit. The sieve 13 forms an elastic lifting structure through the protrusion of the rotating disk 17 and the guide rod 18; the upper outer side of the filter cylinder 14 is provided with several sets of mesh holes, and the lower end of the filter cylinder 14 is completely sealed. The lifting range of the filter cylinder 14 does not exceed the contact position between the sealing gasket and the internal partition of the water storage component 11; a feeding trough 141 is opened inside the filter cylinder 14, and the feeding trough 141 is located in the sealed area at the lower end of the filter cylinder 14. A plug 142 is fitted inside the feeding trough 141, and an elastic bellows 143 is provided below the feeding trough 141. The bottom of the flexible corrugated pipe 143 is fixed at the inlet position of the conveying pipe 19, and the bottom end of the plug 142 is fixed inside the bottom end of the flexible corrugated pipe 143. The lower end of the drain pipe 12 is connected to the first water absorption pipe 121 and the second water absorption pipe 122 through a tee. The first water absorption pipe 121 extends into the upper space inside the water storage device 11, and the second water absorption pipe 122 extends into the lower space inside the water storage device 11 and is connected to the bottom side of the conveying pipe 19. A filter screen is provided at the position where the second water absorption pipe 122 connects to the conveying pipe 19.

[0040] Water seeping into the dry dock chamber 2 first flows through the water collection ditch 9, and then the water in the water collection ditch 9 enters the upper space of the water storage component 11 through the water suction pipe 10. It first flows through the collection screen hopper 13, where the particles and silt are initially intercepted. At this time, the fixed motor 15 starts, and its output end drives the transmission component 16 to rotate through the bevel gear assembly, so that the rotating disk 17 on the top of the transmission component 16 rotates synchronously. The protrusions on the edge of the rotating disk 17 periodically abut against the collection screen hopper 13. With the help of the spring on the outside of the guide rod 18, the collection screen hopper 13 and the filter cylinder 14 integrated with it are driven to perform elastic lifting and shaking. During this lifting and shaking process, the small particles and silt left in the filter cylinder 14 are gathered downward by the vibration. At the same time, the force generated by the shaking presses down the stopper block 142, causing the stopper block 142 to move down and open the discharge chute 141. The silt and sand, along with some of the water, pass through the elastic bellows 14. 3. Water falls into the conveying pipe 19. The output end of the fixed motor 15 synchronously drives the conveying auger 20 in the conveying pipe 19 to rotate, conveying the mixture of mud and water in the pipe. During the conveying process, the second water suction pipe 122, which extends into the space under the water storage device 11 and is connected to one side of the bottom of the conveying pipe 19, will absorb the water in the conveying pipe 19 and discharge it into the drain pipe 12. The sand and gravel are discharged from the end of the conveying pipe 19 that extends out of the water storage device 11 under the continuous push of the conveying auger 20. At the same time, the filter screen at the connection between the second water suction pipe 122 and the conveying pipe 19 is also equipped with a backwashing pipe on one side. By reversing the water injection to clean the mud and sand on the filter screen, it can intercept the fine sand and gravel flowing with the water source and prevent them from entering the water pipe and causing blockage. The clean water in the space above the water storage device 11 is discharged into the drain pipe 12 through the first water suction pipe 121.

[0041] Example 2: For ease of construction, please refer to the attached document. Figure 1 -Appendix Figure 4 The main structure of the caisson dry dock includes a caisson dry dock wall 1 cast in the foundation, a dry dock chamber 2 inside the caisson dry dock wall 1, a dock gate 4 that is raised and lowered on one side of the caisson dry dock wall 1, a climbing frame 5 that is fixedly installed inside the caisson dry dock wall 1, and a working area 6 at the center of the inner side of the dry dock chamber 2; a layer of sand 7 is laid on the upper side of the inner side of the dry dock chamber 2, and a layer of geomembrane 8 is laid on top of the sand layer 7; the top surface of the dry dock chamber 2 is arched upwards, and the working area 6 is set horizontally with an inclination angle of 1° to 2°; a water accumulation ditch 9 is opened on the inner edge of the dry dock chamber 2 near the water storage component 11; and a lifting component 3 is also installed on the side of the caisson dry dock wall 1 near the dock gate 4.

[0042] The dry dock wall 1 is cast on the foundation, serving as the core load-bearing and enclosure structure. Its inner side encloses the dry dock chamber 2 for caisson prefabrication, providing a closed and stable working cavity for caisson manufacturing while resisting external water and soil pressure, ensuring a stable internal construction environment. The working area 6 at the center of the dry dock chamber 2 is horizontally positioned to meet the foundation flatness requirements for caisson prefabrication. The upward arched slope of the top surface of the dry dock chamber 2 (1 to 2 degrees) guides any small amount of seeping water to flow naturally along the slope towards the inner edge near the water storage component 11, ultimately converging into the drainage ditch 9, achieving centralized collection of seepage water and preventing water accumulation in the working area 6. The sand layer 7 laid above the inner side of the dry dock chamber 2 serves both leveling and buffering functions, while the geomembrane layer 8 on top forms a seepage barrier, significantly reducing the infiltration of groundwater or external seepage into the dry dock chamber 2, reducing the burden on the drainage system from the source, and further enhancing the dryness of the dry dock chamber 2 in conjunction with the drainage ditch 9. The drop-down dock gate 4 can flexibly control the opening and closing of the dry dock chamber 2: it is closed during the construction phase to isolate external water sources and ensure a dry construction environment inside; it is opened after the caisson is prefabricated to facilitate the removal of the caisson; the climbing frame 5 on the inner side of the wall provides a safe climbing passage for construction personnel, facilitating the installation and maintenance of the inner wall and top structure of the dry dock chamber 2; the lifting component 3 on the side near the dock gate 4 is used for hoisting and transporting the raw materials and components required for the prefabrication of the caisson, as well as the removal of the finished caisson, improving the convenience and efficiency of construction.

[0043] A construction method for a caisson dry dock, the specific method of which is as follows:

[0044] S1: Pour the dry dock wall 1 on the foundation to form the inner dry dock chamber 2, delineate the horizontal working area 6, and control the top surface of the dry dock chamber 2 to arch upwards with an inclination angle of 1° to 2°; install the climbing frame 5 on the inner side of the dry dock wall 1, install the lifting component 3 on the side near the dock gate 4, and raise and lower the dock gate 4.

[0045] S2: A sand layer 7 and a geomembrane layer 8 are laid sequentially on the upper inner side of the dry dock chamber 2, and a water accumulation ditch 9 is opened on the inner edge of the dry dock chamber 2 near the water storage component 11.

[0046] S3: Fix the water storage component 11 to the top of the dry dock chamber 2, install the water suction pipe 10, and connect the water storage component 11 to the water pipe 12 through the conveying pump; install a partition inside the water storage component 11 to divide the upper and lower spaces, install the material collection screen hopper 13 in the upper space, fix the filter cylinder 14 at its lower end and extend into the lower space, and install a sealing gasket near the partition at the lower end of the filter cylinder 14.

[0047] S4: A fixed motor 15 is installed in the space below the water storage component 11, with its output end extending into the conveying pipe 19 and fixing the conveying auger 20. One side of the conveying pipe 19 extends out of the water storage component 11. The fixed motor 15 is connected to the transmission component 16 through a bevel gear assembly. A rotating disk 17 is installed on the top of the transmission component 16 so that the protrusion fits against the collection screen hopper 13. A guide rod 18 is installed on the inner wall of the water storage component 11 and fitted with a spring, which passes through the collection screen hopper 13 to form an elastic lifting structure.

[0048] S5: A material trough 141 is opened in the sealing area at the lower end of the filter cylinder 14 and a plug 142 is installed. An elastic bellows 143 is installed below to connect to the inlet of the conveying pipe 19. The bottom end of the plug 142 is fixed to the inside of the bellows.

[0049] S6: Connect the drain pipe 12 to the first water intake pipe 121 and the second water intake pipe 122 using a T-connector. The first water intake pipe 121 extends into the upper space of the water storage device 11, and the second water intake pipe 122 extends into the lower space and connects to the delivery pipe 19. A filter screen is installed at the connection point.

[0050] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A caisson dry dock structure, comprising a main body of the caisson dry dock structure and a drainage system disposed on one side thereof, characterized in that: The main structure of the caisson dry dock includes a caisson dry dock wall (1) cast on the foundation. The inner side of the caisson dry dock wall (1) is a dry dock chamber (2). A dock door (4) is raised and lowered on one side of the caisson dry dock wall (1). A climbing frame (5) is fixedly installed on the inner side of the caisson dry dock wall (1). The center of the inner side of the dry dock chamber (2) is a working area (6). The drainage system includes a water storage device (11) fixedly installed on the top of the dry dock chamber (2). The top of the water storage device (11) is connected to a drain pipe (12) through a delivery pump. Several sets of suction pipes (10) are provided on the outer side of the upper end of the water storage device (11) for absorbing and discharging the water seeping into the dry dock chamber (2).

2. The caisson dry dock structure according to claim 1, characterized in that: A layer of sand (7) is laid on the upper inner side of the dry dock chamber (2), and a layer of geomembrane (8) is laid on top of the sand layer (7). The top surface of the dry dock chamber (2) is arched upwards, and the working area (6) is set horizontally with an inclination angle of 1° to 2°. A water accumulation ditch (9) is opened on the inner edge of the dry dock chamber (2) near the water storage device (11). A lifting device (3) is also installed on the side of the dry dock wall (1) near the dock gate (4).

3. The caisson dry dock structure according to claim 1, characterized in that: The water storage component (11) is divided into an upper space and a lower space by a set of partitions. A material collection sieve (13) is provided inside the upper space of the water storage component (11). A filter cylinder (14) is fixed at the lower end of the material collection sieve (13). The bottom end of the filter cylinder (14) slides into the lower space of the water storage component (11). A sealing gasket is provided at the sliding position of the lower end of the filter cylinder (14) near the partition. The sealing gasket is fixed inside the through hole of the partition inside the water storage component (11) and slides against the outer wall of the filter cylinder (14).

4. A caisson dry dock structure according to claim 3, characterized in that: A fixed motor (15) is fixed on one side of the space under the water storage component (11). The output end of the fixed motor (15) extends into the inside of the conveying pipe (19), and the output end of the fixed motor (15) is fixed on one side of the conveying auger (20). One side of the conveying pipe (19) extends out of the outside of the water storage component (11).

5. A caisson dry dock structure according to claim 4, characterized in that: The output end of the fixed motor (15) is connected to the transmission component (16) via a bevel gear assembly. A rotating disk (17) is fixed on the top of the transmission component (16). A protrusion is fixed on the outer edge of the rotating disk (17). The outer edge of the protrusion is attached to the outer side of the collecting sieve hopper (13). The top edge of the collecting sieve hopper (13) is slidably disposed on the outer side of the guide rod (18).

6. A caisson dry dock structure according to claim 5, characterized in that: The guide rod (18) is fixed at both ends to the inner wall of the water storage component (11). A spring is provided on the outside of the guide rod (18). The bottom end of the spring abuts against the outside of the collecting screen hopper (13). The collecting screen hopper (13) and the filter cylinder (14) are integrated. The collecting screen hopper (13) and the guide rod (18) form an elastic lifting structure through the protrusion of the rotating disk (17).

7. A caisson dry dock structure according to claim 3, characterized in that: The filter cylinder (14) has several sets of mesh holes on the outer side of its upper end. The lower end of the filter cylinder (14) is sealed. The lifting range of the filter cylinder (14) does not exceed the contact position between the sealing gasket and the internal partition of the water storage component (11).

8. A caisson dry dock structure according to claim 7, characterized in that: The filter cylinder (14) has a feeding groove (141) inside. The feeding groove (141) is located in the sealing area at the lower end of the filter cylinder (14). A plug (142) is fitted inside the feeding groove (141). An elastic corrugated pipe (143) is provided below the feeding groove (141). The bottom of the elastic corrugated pipe (143) is fixed at the inlet position of the conveying pipe (19). The bottom end of the plug (142) is fixed inside the bottom end of the elastic corrugated pipe (143).

9. A caisson dry dock structure according to claim 3, characterized in that: The lower end of the drain pipe (12) is connected to a first water absorption pipe (121) and a second water absorption pipe (122) via a tee. The first water absorption pipe (121) extends into the upper space inside the water storage device (11), and the second water absorption pipe (122) extends into the lower space inside the water storage device (11) and is connected to the bottom side of the conveying pipe (19). A filter screen is provided at the position where the second water absorption pipe (122) connects to the conveying pipe (19).

10. A construction method for a caisson dry dock, applicable to the caisson dry dock structure of any one of claims 1-9, characterized in that: The specific method for this smearing technique is as follows: S1: Pour the dry dock wall (1) on the foundation to form the inner dry dock chamber (2), delineate the horizontal working area (6), and control the top surface of the dry dock chamber (2) to arch upwards with an inclination angle of 1° to 2°; install the climbing frame (5) on the inner side of the dry dock wall (1), install the lifting component (3) on the side near the dock gate (4), and raise and lower the dock gate (4). S2: A sand layer (7) and a geomembrane layer (8) are laid in sequence on the upper inner side of the dry dock (2), and a water accumulation ditch (9) is opened on the inner edge of the dry dock (2) near the water storage device (11). S3: Fix the water storage unit (11) to the top of the dry dock chamber (2), install the water suction pipe (10), and connect the water storage unit (11) and the water pipe (12) through the delivery pump; install a partition in the water storage unit (11) to divide the upper and lower spaces, install the material collection sieve hopper (13) in the upper space, fix the filter cylinder (14) at its lower end and extend into the lower space, and install a sealing gasket at the lower end of the filter cylinder (14) near the partition; S4: Install a fixed motor (15) in the space under the water storage component (11), with its output end extending into the conveying pipe (19) and fixing the conveying auger (20). One side of the conveying pipe (19) extends out of the water storage component (11). Connect the fixed motor (15) and the transmission component (16) through a bevel gear assembly. Install a rotating disk (17) on the top of the transmission component (16) so that the protrusion fits against the collection screen hopper (13). Install a guide rod (18) on the inner wall of the water storage component (11) and fit a spring through it to form an elastic lifting structure through the collection screen hopper (13). S5: A feeding trough (141) is opened in the sealing area at the lower end of the filter cylinder (14) and a plug (142) is installed. An elastic bellows (143) is installed below to connect to the inlet of the conveying pipe (19). The bottom end of the plug (142) is fixed to the inside of the bellows. S6: Connect the drain pipe (12) to the first water intake pipe (121) and the second water intake pipe (122) using a T-connector. The first water intake pipe (121) extends into the upper space of the water storage device (11), and the second water intake pipe (122) extends into the lower space and connects to the delivery pipe (19). Install a filter screen at the connection point.

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