An air-separated gravity caisson structure and its construction and maintenance methods

Abstract

The present invention belongs to the field of gravity caisson structure manufacturing and construction technology, and provides a hollow gravity caisson structure and construction and maintenance method. The structure mainly includes a caisson body, and along the outer surface of the caisson body, a plurality of mutually independent permeable compartments and backfill compartments are sequentially arranged in the caisson body in the direction of its inner side surface; a plurality of permeable areas are provided on the outer surface of the caisson body corresponding to the permeable compartments, and a permeable plug is detachably provided on the permeable area. The permeable plug is provided with a plurality of permeable holes that can connect the permeable compartments with the outer side of the caisson body. The present invention can reduce the impact of wind and waves on the dock structure and the impact of water flow on the base bed, making the functional use of the dock structure safer and more reliable, and effectively reducing operating costs.

Description

Technical Field

[0001] The invention belongs to the technical field of gravity caisson structure manufacturing and construction, and particularly relates to a hollowed-out gravity caisson structure and a construction and maintenance method. Background Art

[0002] In recent years, with the continuous development of my country's port and waterway transportation industry, a large number of wharves have been built in coastal port cities. Gravity wharves have gained widespread application due to their high load-bearing capacity, durability, and low cost. Caisson structures, which utilize prefabricated reinforced concrete caissons as the main structural element, offer excellent overall performance and rapid construction, making them one of the primary structural types used in gravity wharves. Breakwaters, located on the periphery of ports, play a crucial role in shielding port waters, protecting against the intrusion of wind, waves, and ice from offshore winds, and preventing siltation. Vertical breakwaters are a basic breakwater structure, often employing a gravity caisson structure with an interior that doubles as a wharf.

[0003] Coastal ports in South China are chronically exposed to typhoons and other severe weather conditions. Compared to other regions, docks and breakwater structures are subject to harsher wave and current conditions, making them more susceptible to damage from wind and waves. Traditional caisson structures, with their monolithic exterior surfaces, are subject to wave impact, and their subgrades are directly eroded and hollowed by currents. This poses a significant threat to the dock's functionality and safe operation, significantly increasing maintenance costs. Furthermore, existing caisson structures are typically monolithic, making maintenance difficult and requiring hazardous underwater repairs. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a hollow gravity caisson structure and a construction and maintenance method, so as to reduce the impact of wind and waves on the dock structure and the impact of water flow on the base bed, so that the functional use of the dock structure can be safer and more reliable, and the operating costs can be effectively reduced.

[0005] The technical solution adopted by the present invention to solve its technical problem is:

[0006] A hollowed-out gravity caisson structure comprises a caisson body, wherein a plurality of mutually independent permeable compartments and backfill compartments are sequentially arranged in the caisson body along the direction from the outer side of the caisson body to the inner side thereof;

[0007] A plurality of water-permeable areas are provided on the outer surface of the caisson body corresponding to the water-permeable chambers, and a water-permeable plug plate is detachably provided on the water-permeable area. The water-permeable plug plate is provided with a plurality of water-permeable holes that can connect the water-permeable chamber with the outer side of the caisson body.

[0008] Preferably, a first clamping structure is provided between the water permeable area and the water permeable plug plate, the first clamping structure comprising a plurality of protrusions arranged at intervals on the side of the water permeable plug plate, and grooves arranged on the water permeable area corresponding to the protrusions, the protrusions being clamped and connected to the grooves.

[0009] Preferably, the protrusion is arranged at an angle, and the lower end of the inclined arrangement is the end close to the caisson body.

[0010] Preferably, the first clamping structure further includes inclined mounting surfaces provided at the upper and lower ends of the water-permeable insert, and inclined fitting grooves provided at the upper and lower ends of the water-permeable area corresponding to the inclined mounting surfaces.

[0011] Preferably, a plurality of embedded hanging parts are provided on the outer side surface of the permeable insert.

[0012] Preferably, a base bed baffle structure is provided extending outward from the bottom end of the caisson body, and the base bed baffle structure includes a plurality of prefabricated baffles, which are detachably assembled and installed between the plurality of prefabricated baffles and between the prefabricated baffles and the caisson body.

[0013] Preferably, a second clamping structure is provided between a plurality of the prefabricated baffles and between the prefabricated baffles and the caisson body, the second clamping structure comprising a connecting groove provided on the splicing edge of the prefabricated baffles and the splicing edge of the caisson body, and a connecting piece embedded in the connecting groove;

[0014] The width of the middle portion of the connecting member is smaller than the width of the two end portions thereof, and the shape of the connecting groove is adapted to the shape of the connecting member.

[0015] A construction method for a hollowed-out gravity caisson structure, applicable to the hollowed-out gravity caisson structure described above, comprises the following steps:

[0016] S10. Prefabricate the caisson body, permeable inserts, prefabricated baffles, and connectors;

[0017] S30. Install the permeable insert on the caisson body; apply lubricant to the protrusions of the permeable insert and the grooves of the caisson body, then hoist the permeable insert so that it aligns with the permeable area of the caisson body and engages the protrusions with the grooves, so that the permeable insert is embedded in the caisson body.

[0018] S50 excavation of the foundation trench, and completion of the construction of the base bed on the foundation trench;

[0019] S70. After the caisson body is floated to the target area, water is injected into the caisson body and the position is adjusted so that the caisson body is seated on the base bed. The backfill compartment of the caisson body is then backfilled. At this point, the construction of the dock structure on top of the caisson body can begin.

[0020] S90. Hoist the prefabricated baffles on the base bed on the outer side surface of the caisson body, and install the connecting parts between adjacent prefabricated baffles and between the prefabricated baffles and the caisson body.

[0021] Furthermore, the setting height of the permeable area is less than the setting height of the caisson body, and the permeable area is set close to the top of the caisson body; therefore, in step S70, the permeable compartment of the caisson body can be partially backfilled, and a baffle can be set on the top after backfilling, wherein the top height of the baffle is lower than the bottom height of the permeable area.

[0022] A maintenance method for a hollowed-out gravity caisson structure is applicable to the hollowed-out gravity caisson structure described above, comprising the following steps:

[0023] S20. Remove the old permeable insert; hoist and remove the permeable insert installed on the caisson body;

[0024] S40. Install the new permeable insert; apply lubricant to the protrusions on the new permeable insert, then hoist the new permeable insert so that it corresponds to the permeable area of the caisson body, and ensure that the protrusions are snap-fitted into the grooves on the permeable area, so that the new permeable insert is embedded in the caisson body;

[0025] S60. Remove the old prefabricated baffles; at this time, first remove the connectors between the prefabricated baffles and between the prefabricated baffles and the caisson body, and then lift the corresponding prefabricated baffles away;

[0026] S80. Install the new prefabricated baffles; hoist the new prefabricated baffles onto the base bed, and then reinstall the connecting parts to connect the adjacent prefabricated baffles and the prefabricated baffles and the caisson body into a whole.

[0027] Compared with the prior art, the beneficial effects of the present invention include:

[0028] The hollowed-out gravity caisson structure provided in this solution can effectively reduce the impact of wind and waves on the caisson body and the scouring of the base bed by water flow, avoid structural damage, and greatly enhance the safety of the dock structure. Permeable inserts and prefabricated baffles are used as the main body to resist wind and waves and water flow, which facilitates subsequent maintenance and replacement, significantly reducing subsequent maintenance costs.

[0029] The construction method of a hollow gravity caisson structure provided in this solution can provide a technical solution for the construction of the above-mentioned caisson structure based on the above-mentioned caisson structure, and effectively ensure the construction efficiency during the construction of the caisson structure.

[0030] The maintenance method of a hollowed-out gravity caisson structure provided in this solution, based on the above-mentioned caisson structure, can make the later maintenance and replacement operations of the caisson structure more convenient, and reduce the difficulty and cost of operation and maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 It is a structural schematic diagram of the caisson structure of the present invention.

[0033] Figure 2 It is a side structural schematic diagram of the caisson structure of the present invention.

[0034] Figure 3 It is a schematic diagram of the top view of the caisson structure of the present invention.

[0035] Figure 4 It is a schematic cross-sectional structural diagram of the caisson structure of the present invention.

[0036] Figure 5 It is a structural schematic diagram of the caisson body of the present invention.

[0037] Figure 6 It is a structural schematic diagram of the water-permeable insert of the present invention.

[0038] Figure 7 This is a schematic structural diagram of the prefabricated baffle of the present invention.

[0039] Figure 8 This is a structural diagram of a lower connecting piece according to an application example of the present invention.

[0040] Figure 9 This is a schematic diagram of the installation structure of the water-permeable insert in the water-permeable area of the present invention.

[0041] Figure 10 Schematic diagram of the installation of the connecting piece of the present invention.

[0042] Figure 11 This is a working schematic diagram of the caisson structure of one example of the present invention.

[0043] Figure 12 This is a working schematic diagram of the caisson structure according to another embodiment of the present invention.

[0044] in:

[0045] 1-caisson body, 11-permeable compartment, 111-permeable area, 112-groove, 113-inclined fitting groove, 114-baffle, 12-backfill compartment, 121-concrete top plate, 13-toe;

[0046] 2-permeable insert, 21-permeable hole, 22-bump, 23-inclined mounting surface, 24-embedded hanging parts;

[0047] 3-base bed, 31-base groove;

[0048] 4-bed baffle structure, 41-prefabricated baffle, 411-connecting groove, 42-connecting piece;

[0049] 5- Pier structure. DETAILED DESCRIPTION

[0050] In order to be able to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. In the following description, many specific details are set forth in order to fully understand the present invention. The embodiments described are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative work are within the scope of protection of the present invention.

[0051] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0052] Example 1

[0053] like Figure 1-12As shown, in this embodiment, a hollowed-out gravity caisson structure is provided, which mainly includes a caisson body 1, and along the outer side of the caisson body 1 toward the inner side thereof, a number of mutually independent permeable compartments 11 and backfill compartments 12 are sequentially arranged in the caisson body 1. In this embodiment, the caisson body 1 is in the form of a rectangular box, and the top of the caisson body 1 is open. In addition, the outer side surface mentioned here is mainly the side of the caisson body 1 that is subjected to the impact of water waves; in one of the application examples, the inner side surface of the caisson body 1 can be set as the ground area of the dock structure. In another application example, if there is an inland sea, the side surface close to the inland sea is the above-mentioned inner side surface.

[0054] Furthermore, in this embodiment, a plurality of permeable areas 111 are provided on the outer surface of the caisson body 1 corresponding to the permeable compartments 11; as a preferred solution, the setting height of the permeable areas 111 can be set to be consistent with or close to the height of the caisson body 1 to adapt to applications in areas with large water level changes; and in this solution, as one of the commonly used application examples, the setting height of the permeable areas 111 is set to be less than the height of the caisson body 1, so that the stress state of the bottom of the caisson body 1 can be more reliable after it is installed and fixed.

[0055] A removable permeable insert 2 is provided on the permeable area 111. The permeable insert 2 is provided with a plurality of permeable holes 21 that can connect the permeable compartment 11 with the outside of the caisson body 1. In this embodiment, by disposing the permeable insert 2 so as to be removably mounted on the permeable area 111, the permeable insert 2 can be easily replaced relative to the caisson body 1, thereby relatively extending the service life of the caisson structure. The permeable holes 21 can also act as wave breakers, effectively reducing the impact force of waves directly acting on the caisson structure, preventing damage to the caisson structure from long-term direct impact of waves, and improving the safety of the caisson structure.

[0056] As a preferred solution, in this embodiment, a first clamping structure is provided between the water permeable area 111 and the water permeable plug plate 2, and the first clamping structure includes a plurality of protrusions 22 arranged at intervals on the left and right sides of the water permeable plug plate 2, and grooves 112 arranged on the left and right sides of the water permeable area 111 corresponding to the protrusions 22. Through the clamping connection between the protrusions 22 and the grooves 112, the water permeable plug plate 2 can be embedded in the caisson body 1 to form a caisson structure together.

[0057] Furthermore, in this embodiment, the protrusion 22 and the groove 112 are arranged in corresponding inclined configurations, and the lower end of the inclined configuration is the end close to the caisson body 1. Therefore, during the actual installation operation, it is only necessary to hoist the water-permeable insert 2 to the side of the caisson body 1 and form a relative abutting contact between the protrusion 22 and the groove 112. At this time, the tightening state of the water-permeable insert 2 can be released. Therefore, under the mutual contact and guidance between the protrusion 22 and the groove 112, the water-permeable insert 2 can be embedded in the water-permeable area 111 under the action of gravity, which greatly reduces the difficulty of installing the caisson structure and facilitates improving construction efficiency.

[0058] As a preferred solution, in this embodiment, the first engaging structure further includes inclined mounting surfaces 23 provided at the upper and lower ends of the water-permeable insert 2, and inclined fitting grooves 113 provided at the upper and lower ends of the water-permeable area 111 corresponding to the inclined mounting surfaces 23. The inclined mounting surfaces 23 and inclined fitting grooves 113 ensure a better end-face fit between the water-permeable insert 2 and the caisson body 1 after installation.

[0059] In addition, in this embodiment, a number of toes 13 are arranged at intervals at the bottom end of the caisson body 1, thereby forming an uneven structural surface at the bottom of the caisson body 1, which is convenient for improving the connection strength between the caisson body 1 and the base bed 3, so that the force-bearing performance of the caisson body 1 after installation can be better.

[0060] Several pre-embedded hanging parts 24 are provided on the outer surface of the permeable insert 2. In this embodiment, the pre-embedded hanging parts 24 are arranged in a matrix at the four ends of the permeable insert 2 to facilitate transportation and lifting of the permeable insert 2. The pre-embedded hanging parts 24 can be in the form of pre-embedded lifting rings, pre-embedded lifting hooks, or pre-embedded bolts, without specific limitation.

[0061] Furthermore, in this embodiment, a base bed baffle structure 4 is provided at the bottom end of the caisson body 1 and extends outward. As described above, as one of the application examples, when the inner side of the caisson body 1 is a ground structure, the base bed baffle structure 4 is only provided at one end of the outer side surface of the caisson body 1; and when there is an inland sea on the inner side of the caisson body 1, the base bed baffle structure 4 can be provided on both sides of the caisson body 1.

[0062] As a preferred solution, the bed baffle structure 4 includes a plurality of prefabricated baffles 41, which are detachably assembled between the plurality of prefabricated baffles 41 and between the prefabricated baffles 41 and the caisson body 1. In this embodiment, the prefabricated baffles 41 are connected and installed on the toe structure of the caisson body 1.

[0063] Furthermore, a second clamping structure is provided between the plurality of prefabricated baffles 41 and between the prefabricated baffles 41 and the caisson body 1. The second clamping structure includes a connecting groove 411 provided on the splicing edges of the prefabricated baffles 41 and the splicing edges of the caisson body 1, and a connecting member 42 embedded in the connecting groove 411. The shape of the connecting groove 411 matches the shape of the connecting member 42. By embedding the connecting member 42 in the connecting groove 411, the adjacent prefabricated baffles 41 and the prefabricated baffles 41 and the caisson body 1 are connected into a whole, thereby providing overall force-bearing performance.

[0064] As a preferred solution, in this embodiment, the middle width value of the connecting member 42 is smaller than the width value of its two end portions, so that after the connecting member 42 is embedded and installed in the connecting groove 411, the two adjacent prefabricated baffles 41 and the prefabricated baffles 41 and the caisson body 1 cannot move relative to each other, thereby ensuring the overall stability after installation.

[0065] Furthermore, the depth of the connecting groove 411 set in this embodiment is less than the thickness of the prefabricated baffle 41, and the thickness of the connecting member 42 is adapted to the depth of the connecting groove 411, thereby effectively avoiding the scouring effect of water flow on the base bed 3 from the installation point of the connecting member 42 and the connecting groove 411 after the prefabricated baffle 41 is installed, further ensuring the protection of the base bed 3.

[0066] In order to facilitate further understanding of this solution, this embodiment also provides a construction method of a hollowed-out gravity caisson structure, which is applicable to the hollowed-out gravity caisson structure described above and mainly includes the following steps:

[0067] S10. Carry out prefabrication of the caisson body 1, the permeable insert 2, the prefabricated baffle 41 and the connecting piece 42 in the factory; during production, formwork is constructed corresponding to the caisson body 1, the permeable insert 2, the prefabricated baffle 41 and the connecting piece 42. Since a plurality of the toes 13 are provided at the bottom of the caisson body 1, it is necessary to install pads when constructing the formwork at the concave portion of the toes 13 to ensure stable force during subsequent reinforcement and concrete pouring; and when pouring the caisson body 1, a layered pouring method is adopted to ensure the molding quality of the caisson body 1.

[0068] S30. Install the water-permeable insert 2 on the caisson body 1; after the caisson body 1 and the water-permeable insert 2 are prefabricated, the water-permeable insert 2 is hoisted and installed on the caisson body 1 before the caisson body 1 is launched. A lubricant, such as grease, is applied to the protrusion 22 of the water-permeable insert 2 and the groove 112 on the water-permeable area 111 of the caisson body 1; then, a hoisting cable is tied to the embedded hanging piece 24 on the water-permeable insert 2, and a crane is used to hoist the water-permeable insert 2 to the position corresponding to the water-permeable area 111 of the caisson body 1. At this time, the water-permeable insert 2 can complete the snap connection between the protrusion 22 and the groove 112 under the action of its own weight, so that the water-permeable insert 2 is embedded and installed on the caisson body 1; the crane can be a gantry crane, a crawler crane, etc., and no specific limitation is made here.

[0069] S50. Use a dredger such as a trailing suction hopper ship, a cutter suction hopper ship, a grab ship, or a bucket ship to excavate the foundation trench 31, and perform backfilling and leveling on the foundation trench 31 after excavation to complete the construction of the base bed 3.

[0070] S70. After the construction of the foundation bed 3 is completed, the caisson body 1 is floated to the target area, for example, by using a semi-submersible barge to float the caisson body 1 above the foundation trench 31. Water is then injected into the caisson body 1 and the position is adjusted so that the caisson body 1 is seated on the foundation bed 3. At this point, the backfill chamber 12 of the caisson body 1 can be backfilled to the designated elevation, and the concrete top slab 121 can be poured. After the concrete top slab 121 has solidified and formed, the pier structure 5 on top of the caisson body 1 can be constructed.

[0071] Furthermore, as one of the application examples, when the setting height of the permeable area 111 is less than the setting height of the caisson body 1, the permeable area 111 is set close to the top of the caisson body 1; therefore, in step S70, the permeable compartment 11 of the caisson body 1 can be partially backfilled, and a baffle 114 can be set on the top after backfilling, wherein the top height of the baffle 114 is lower than the bottom height of the permeable area 111.

[0072] S90. Hoist the prefabricated baffles 41 on the base bed 3 on the front side and / or rear side of the caisson body 1, and install the connecting members 42 between adjacent prefabricated baffles 41 and between the prefabricated baffles 41 and the caisson body 1.

[0073] Here, in actual construction, before the backfilling operation of step S70, the content of step S90 can be directly performed first, and then the cabin backfilling operation of the caisson body 1 is performed, and then the upper structure such as the wave-breaking wall is cast.

[0074] In addition, this embodiment also provides a maintenance method for a hollowed-out gravity caisson structure, which is applicable to the hollowed-out gravity caisson structure described above and mainly includes the following steps:

[0075] S20. Remove the old permeable insert 2. Anchor the crane vessel near the caisson structure requiring maintenance. Select a time period conducive to shallow-water operations with slow currents and moderate tides. Divers tie the lifting cable to the embedded hanger 24 on the permeable insert 2. After ensuring the cable is securely tied, the divers withdraw, and the crane vessel removes the permeable insert 2 to be replaced, which has already been installed on the caisson body 1.

[0076] S40. Install the new permeable insert 2. Apply lubricant to the protrusions 22 on the new permeable insert 2 to be installed. Then, using the same procedures as in step S30, hoist the new permeable insert 2 so that it aligns with the permeable area 111 of the caisson body 1. Ensure that the protrusions 22 are snap-fitted into the grooves 112 on the permeable area 111, so that the new permeable insert 2 is embedded in the caisson body 1.

[0077] S60. Remove the old prefabricated baffle 41. Similarly, during a period of time when the water flow is slow and the tide level is moderate, which is conducive to diving operations, divers remove the connectors 42 around the old prefabricated baffle 41 and between the prefabricated baffle 41 and the caisson body 1, and use a crane vessel to lift out the old prefabricated baffle 41 to be replaced.

[0078] S80. Install the new prefabricated baffles 41. The new prefabricated baffles 41 are hoisted onto the bed 3 and preliminarily assembled on the top surface of the bed 3 at the front and / or rear sides of the caisson body 1. Divers then reinstall the connectors 42 to connect adjacent prefabricated baffles 41 and between the prefabricated baffles 41 and the caisson body 1 into a whole.

[0079] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A hollow gravity caisson structure, characterized in that: The caisson comprises a caisson body, wherein a plurality of mutually independent water-permeable compartments and backfill compartments are sequentially arranged in the caisson body along the direction from the outer side of the caisson body to the inner side thereof; A plurality of water-permeable areas are provided on the outer surface of the caisson body corresponding to the water-permeable compartments, a water-permeable insert is detachably provided on the water-permeable area, and a plurality of water-permeable holes are provided on the water-permeable insert for connecting the water-permeable compartments with the outer side of the caisson body; A first clamping structure is provided between the water-permeable area and the water-permeable insert, the first clamping structure comprising a plurality of protrusions provided at intervals on the side of the water-permeable insert, and grooves provided on the water-permeable area corresponding to the protrusions, the protrusions being clamped and connected to the grooves; The protrusion is arranged in an inclined manner, and the lower end of the inclined arrangement is an end close to the caisson body; A base bed baffle structure is provided extending outward from the bottom end of the caisson body, and the base bed baffle structure includes a plurality of prefabricated baffles, and the prefabricated baffles and the caisson body are detachably assembled and installed; A second clamping structure is provided between the prefabricated baffles and between the prefabricated baffles and the caisson body, the second clamping structure comprising a connecting groove provided on the splicing edge of the prefabricated baffles and the splicing edge of the caisson body, and a connecting piece embedded in the connecting groove; The width of the middle portion of the connecting member is smaller than the width of the two end portions thereof, and the shape of the connecting groove is adapted to the shape of the connecting member; The depth of the connecting groove is smaller than the thickness of the prefabricated baffle, and the thickness of the connecting member is adapted to the depth of the connecting groove.

2. The hollow gravity caisson structure according to claim 1, characterized in that: The first clamping structure further includes inclined mounting surfaces provided at the upper and lower ends of the water-permeable insert, and inclined fitting grooves provided at the upper and lower ends of the water-permeable area corresponding to the inclined mounting surfaces.

3. A hollow gravity caisson structure according to any one of claims 1-2, characterized in that: A plurality of embedded hanging parts are arranged on the outer side surface of the permeable insert plate.

4. A construction method for a hollowed-out gravity caisson structure, applicable to a hollowed-out gravity caisson structure according to any one of claims 1 to 3, characterized in that: The following steps are involved: S10. Prefabricate the caisson body, permeable inserts, prefabricated baffles, and connectors; S30. Install the permeable insert on the caisson body; apply lubricant to the protrusions of the permeable insert and the grooves of the caisson body, then hoist the permeable insert so that it aligns with the permeable area of the caisson body and engages the protrusions with the grooves, so that the permeable insert is embedded in the caisson body. S50 excavation of the foundation trench, and completion of the construction of the base bed on the foundation trench; S70. After the caisson body is floated to the target area, water is injected into the caisson body and the position is adjusted so that the caisson body is seated on the base bed. The backfill compartment of the caisson body is then backfilled, and the pier structure on top of the caisson body is then constructed. S90. Hoist the prefabricated baffles on the base bed on the outer side surface of the caisson body, and install the connecting parts between adjacent prefabricated baffles and between the prefabricated baffles and the caisson body.

5. The construction method of a hollow gravity caisson structure according to claim 4, characterized in that: The setting height of the permeable area is lower than the setting height of the caisson body, and the permeable area is set close to the top of the caisson body; in step S70, the permeable compartment of the caisson body is partially backfilled, and a baffle is set on the top after backfilling, wherein the top height of the baffle is lower than the bottom height of the permeable area.

6. A maintenance method for a hollowed-out gravity caisson structure, applicable to a hollowed-out gravity caisson structure according to any one of claims 1 to 3, characterized in that: The following steps are involved: S20. Remove the old permeable insert; hoist and remove the permeable insert installed on the caisson body; S40. Install a new permeable plate; apply lubricant to the protrusions of the new permeable plate, then hoist the new permeable plate so that it corresponds to the permeable area of the caisson body, and complete the snap connection between the protrusions and the grooves on the permeable area, so that the new permeable plate is embedded in the caisson body; S60. Remove the old prefabricated baffles; at this time, first remove the connectors between the prefabricated baffles and between the prefabricated baffles and the caisson body, and then lift the corresponding prefabricated baffles away; S80. Install new prefabricated baffles; hoist the new prefabricated baffles onto the base bed, and then reinstall the connectors to connect adjacent prefabricated baffles and the prefabricated baffles and the caisson body into a whole.

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