CN112281672A - Auxiliary equipment for integral sinking of open caisson and cofferdam structure and construction method - Google Patents
Auxiliary equipment for integral sinking of open caisson and cofferdam structure and construction method Download PDFInfo
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- CN112281672A CN112281672A CN202011209269.2A CN202011209269A CN112281672A CN 112281672 A CN112281672 A CN 112281672A CN 202011209269 A CN202011209269 A CN 202011209269A CN 112281672 A CN112281672 A CN 112281672A
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- cofferdam
- open caisson
- slurry discharge
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D23/00—Caissons; Construction or placing of caissons
- E02D23/08—Lowering or sinking caissons
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses an auxiliary device for integral sinking of open caisson and cofferdam structures and a construction method thereof. Mixing the cut soil bodies to form slurry, and sucking the slurry out of the drill rod, so that the open caisson and the cofferdam structure sink quickly; the construction method has the advantages that the construction parameters are monitored and controlled in real time, intelligent operation is realized, the method is particularly suitable for strata with uneven soil layer hardness and great strength difference, safety accidents such as structure inclination, displacement and even overturning are avoided, and the safety of engineering construction is improved.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to an auxiliary device for integral sinking of open caisson and cofferdam structures and a construction method.
Background
In recent years, with the rapid development of the infrastructure field of China, various large-scale cross-river and cross-sea bridges emerge endlessly. As a key link of the foundation construction of large bridges, the construction of open caisson and cofferdam becomes an indispensable link.
At the present stage, structures such as open caisson, cofferdam and the like sink, and the structures are mainly matched with mud and sand suction equipment such as an air suction dredge, a cutter suction pump and the like for assistance by self weight, and sink while sucking, and gradually reach the designed elevation. When the method is applied to a soft soil layer or a sand soil layer of a river bottom shallow layer, the effect is good, and the construction efficiency basically can meet the expected requirement. But along with the constantly increase of the degree of depth of sinking, the soil layer intensity of structure bottom is higher and higher, and lateral friction resistance all around constantly increases, leads to the coefficient of sinking of structure to constantly reduce, and the structure sinks more and more slowly, appears the condition that can't sink to the design position even, seriously influences the construction progress, increases construction cost. Especially, when the soil layer at the bottom of the structure is uneven in hardness and greatly different in strength, unexpected safety accidents such as structure inclination, displacement and even overturning are easily caused, and great safety risks are brought to engineering construction.
Disclosure of Invention
The invention aims to solve the technical problem that aiming at the defects in the prior art, the invention provides the auxiliary equipment for the integral sinking of the open caisson and cofferdam structures and the construction method thereof, wherein the cut soil bodies are mixed and then changed into slurry to be sucked out from the drill rod, so that the open caisson and cofferdam structures sink rapidly; the construction method has the advantages that the construction parameters are monitored and controlled in real time, intelligent operation is realized, the method is particularly suitable for strata with uneven soil layer hardness and great strength difference, safety accidents such as structure inclination, displacement and even overturning are avoided, and the safety of engineering construction is improved.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the utility model provides a be used for whole auxiliary assembly that sinks of open caisson and cofferdam class structure, includes running gear, all-round self-propelled high-pressure injection geotome and monitoring system, all-round self-propelled high-pressure injection geotome sets up on running gear, and running gear arranges in open caisson or cofferdam inner wall, and all-round self-propelled high-pressure injection geotome's lower extreme stretches into to the below of open caisson or cofferdam, and pressure sensor has been laid to the lower extreme of open caisson or cofferdam, and monitoring system is connected with pressure sensor.
According to the technical scheme, all-round self-propelled high pressure injection geotome includes the drilling rod, the air compressor machine, power device and slush pump, the lower extreme of drilling rod is equipped with front end slotting device, power device and front end slotting device are connected, front end slotting device is used for cutting the soil body of open caisson or cofferdam below, pressure sensor sets up in front end slotting device department, the inside row's thick liquid passageway that is equipped with of drilling rod, water jet hole and main gas port, the air compressor machine is connected with the main gas port, the water jet hole is connected with high pressure water pump, the highly-compressed air that injects the air compressor machine and the water that the water jet hole jets out fully mix and jet out through the water jet hole, the high pressure water that jets forms the mud after mixing with the soil body of being cut, slush pump and row's thick.
According to the technical scheme, the drill rod is also internally provided with a slurry discharge port, a slurry discharge water inlet hole and a slurry discharge air inlet hole, and the slurry discharge port, the slurry discharge water inlet hole and the slurry discharge air inlet hole are communicated with a slurry discharge channel; water and air are injected into the slurry discharge channel through the slurry discharge water inlet hole and the slurry discharge air inlet hole, and slurry sucked from the slurry discharge port is discharged to the outside from the slurry discharge pipeline.
According to the technical scheme, the soil cutting pore canal is arranged outside the drill rod.
According to the technical scheme, the pressure sensor is arranged at the lower end of the omnibearing self-propelled high-pressure jet soil taking equipment.
According to the technical scheme, the monitoring system is used for receiving and processing the transmission data of the pressure sensor.
According to the technical scheme, the travelling mechanism comprises a guide rail and a driving device, the guide rail is transversely arranged along the inner wall of the open caisson or the cofferdam, a sliding block is arranged on the guide rail, and the sliding block is connected with the omnibearing self-propelled high-pressure jet soil sampling equipment;
the driving device comprises chain wheels, a chain and a driving motor, the chain wheels are arranged at two ends of the guide rail and are connected through the chain, the sliding block is connected with the chain, and the driving motor is connected with one of the chain wheels; the driving motor drives the chain wheel to rotate, and the all-dimensional self-propelled high-pressure injection soil sampling equipment is driven by the chain to move back and forth along the guide rail through the sliding block.
According to the technical scheme, the chain and the chain wheel are replaced by the steel wire rope and the steel wire belt wheel.
According to the technical scheme, the power device is fixedly arranged on the drill rod and comprises a motor or a hydraulic motor, and the motor or the hydraulic motor is connected with the front-end slotting equipment; and power is provided for the front end slotting equipment.
The omnibearing self-propelled high-pressure injection soil sampling equipment consists of a drill rod, a power device and front end slotting equipment, is arranged on a travelling mechanism, can freely travel along with the travelling mechanism in open caisson and cofferdam structures at any position to perform soil sampling operation, and can also rotate at any angle according to the field environment and operation requirements.
The drilling rod be equipped with outside soil cutting pore and inside mud discharging pore, pass through the pipe connection with supporting facilities such as air compressor machine, high-pressure water pump, water storage tank, possess quick soil cutting and high-efficient mud discharging function.
According to the technical scheme, the front-end slotting equipment comprises a drill bit and/or a ditching machine.
A construction method adopting the integral sinking auxiliary equipment for the open caisson and cofferdam structure comprises the following steps:
1) sinking by self weight in the modes of water injection, heightening and the like in the cofferdam until the cofferdam cannot sink by self weight;
2) starting the omnibearing self-propelled high-pressure jet soil sampling equipment, cutting the soil body at the bottom of the edge angle of the cofferdam and sucking out the cut soil body, so that the resistance at the end part of the cofferdam is reduced, and the sinking speed of the cofferdam is accelerated;
3) and after the cofferdam is sunk in place, taking out the auxiliary sinking equipment, sealing the bottom of the cofferdam and starting foundation construction.
The invention has the following beneficial effects:
the invention has the integral walking function, can walk along the inner walls of the open caisson and the cofferdam structure, directionally cuts the soil body at the bottom of the cutting edge of the open caisson and the cofferdam structure by injecting a high-pressure gas-water mixture through the drill rod inserted into the deep part of the soil body, mixes the cut soil body into slurry and sucks the slurry out of the drill rod, thereby leading the open caisson and the cofferdam structure to sink rapidly; through pressure sensor, the whole intelligent control system of cooperation equipment, real-time supervision and control construction parameter realize intelligent operation, are particularly useful for the stratum that the soil layer is soft or hard inequality, intensity difference is very big, avoid taking place incident such as structure slope, aversion even turn over, have improved the security of engineering construction.
Drawings
FIG. 1 is a schematic layout of an integral sinking auxiliary device for open caisson and cofferdam structures in the embodiment of the invention;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of the portion of FIG. 2 taken from the direction B;
FIG. 4 is a cross-sectional view C-C of FIG. 3;
in the figure, 1-drill rod, 2-omnibearing self-propelled high-pressure injection soil sampling equipment, 3-hydraulic system, 4-slurry pump, 5-air compressor, 6-temporary platform, 7-guide rail, 8-cofferdam, 9-power device, 10-front end slotting equipment, 11-slurry discharge channel, 12-main air hole, 13-water jet hole, 14-slurry discharge water inlet hole, 15-slurry discharge port and 16-slurry discharge air inlet hole.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and examples.
Referring to fig. 1 to 4, the auxiliary device for integral sinking of the open caisson and cofferdam structure in one embodiment of the present invention includes a traveling mechanism, an all-directional self-propelled high-pressure injection and soil-taking device 2 and a monitoring system 3, the all-directional self-propelled high-pressure injection and soil-taking device 2 is disposed on the traveling mechanism, the lower end of the all-directional self-propelled high-pressure injection and soil-taking device 2 extends to the lower part of the open caisson or cofferdam 8, a pressure sensor is disposed at the lower end of the open caisson or cofferdam 8, and the monitoring system is connected to the pressure sensor.
Furthermore, the omnibearing self-propelled high-pressure injection soil taking equipment 2 comprises a drill rod 1, an air compressor 5, a power device 9 and a slurry pump 4, wherein the lower end of the drill rod 1 is provided with front-end slotting equipment 10, the power device 9 is connected with the front-end slotting equipment 10, the front-end slotting equipment 10 is used for cutting soil mass below a sunk well or a cofferdam 8, a pressure sensor is arranged at the front-end slotting equipment 10, a slurry discharge channel 11, a water injection hole 13 and a main gas hole 12 are arranged inside the drill rod 1, the air compressor 5 is connected with the main gas hole 12, the water injection hole 13 is connected with a high-pressure water pump, high-pressure air injected by the air compressor 5 and water injected by the water injection hole 13 are fully mixed and injected through the water injection hole 13, the injected high-pressure water and the cut soil mass are mixed to form slurry, and the slurry pump 4 is connected with the slurry; the lower end of the drill rod 1 extends into the lower part of the open caisson or the cofferdam 8, soil mass below the open caisson or the cofferdam 8 is cut and sucked out, the resistance at the end part of the open caisson or the cofferdam 8 is reduced, and the sinking of the open caisson or the cofferdam 8 is accelerated.
Furthermore, the drill rod 1 is also internally provided with a water jet hole 13, a slurry discharge port 15, a slurry discharge water inlet hole 14 and a slurry discharge air inlet hole 16.
Furthermore, the water injection hole, the main air hole, the slurry discharge air inlet hole and the slurry discharge water inlet hole are circumferentially arranged along the slurry discharge channel.
Furthermore, the outside of the drill rod 1 is provided with a soil cutting hole.
Further, the pressure sensor is arranged at the lower end of the omnibearing self-propelled high-pressure injection soil taking device 2.
Further, pressure sensor includes but not limited to arrange in the pressure sensor of 2 tip of all-round self-propelled high pressure injection geotome, and monitoring system guarantees construction safety through pressure sensor dynamic monitoring open caisson, 8 structure sinking operations in cofferdam.
Further, the monitoring system is used for receiving and processing the transmission data of the pressure sensor.
Further, the travelling mechanism comprises a guide rail 7 and a driving device, the guide rail 7 is transversely arranged along the inner wall of the open caisson or the cofferdam 8, a slide block is arranged on the guide rail 7, and the slide block is connected with the omnibearing self-propelled high-pressure jet soil sampling equipment 2;
the driving device comprises chain wheels, a chain and a driving motor, the chain wheels are arranged at two ends of the guide rail 7 and connected through the chain, the sliding block is connected with the chain, and the driving motor is connected with one of the chain wheels; the driving motor drives the chain wheel to rotate, and the all-dimensional self-propelled high-pressure injection soil sampling equipment 2 is driven by the chain to move back and forth along the guide rail 7 through the slide block.
Further, the chain and sprockets are replaced with wire rope and wire pulleys.
Further, a power device 9 is fixedly arranged on the drill rod 1, the power device 9 comprises a motor or a hydraulic motor, and the motor or the hydraulic motor is connected with the front end slotting equipment 10; to power the front-end trenching apparatus 10.
The omnibearing self-propelled high-pressure injection soil sampling device 2 consists of a drill rod 1, a power device 9 and a front end slotting device 10, is arranged on a travelling mechanism, can freely travel along with the travelling mechanism in any position of open caisson and cofferdam 8 structures to perform soil sampling operation, and can also rotate by any angle according to the field environment and operation requirements.
The drill rod 1 is provided with an external soil cutting pore channel and an internal mud discharging pore channel, is connected with matched facilities such as an air compressor 5, a high-pressure water pump and a water storage tank through pipelines, and has the functions of quickly cutting soil and efficiently discharging mud.
Further, the front-end trenching apparatus 10 comprises a drill and/or a trencher; carry out the grooving operation through drill bit and ditching machine at all-round self-propelled high-pressure injection geotome 2 front end, guarantee that all-round self-propelled high-pressure injection geotome 2 can get into the deep portion of soil layer and be close to open caisson, 8 class structures sword angles in cofferdam as far as possible, cutting sword angle tip soil body on the widest range and in time discharge reduce sword angle tip resistance, help open caisson, 8 class structures in cofferdam to sink fast.
Further, the high-pressure water injection device is connected with a high-pressure water pump.
A construction method adopting the integral sinking auxiliary equipment for the open caisson and cofferdam structure comprises the following steps:
1) sinking by self weight in the modes of water injection, heightening and the like in the cofferdam 8 until the cofferdam 8 cannot sink by self weight;
2) starting the omnibearing self-propelled high-pressure jet soil sampling equipment 2, cutting the soil body at the bottom of the edge angle of the cofferdam 8 and sucking out the cut soil body, reducing the resistance at the end part of the cofferdam 8 and accelerating the sinking speed of the cofferdam 8;
3) and after the cofferdam 8 sinks to the proper position, taking out the auxiliary sinking equipment, and then sealing the bottom of the cofferdam 8 to start foundation construction.
Further, in the above steps, the cofferdam is the open caisson.
Before step 1), after the assembly of the bottom cofferdam 8, a plurality of devices are uniformly and symmetrically arranged along the inner side of the cofferdam 8, and the method mainly comprises the following steps: the device comprises a guide rail 7, an omnibearing self-propelled high-pressure injection soil sampling device 2, a monitoring system, a hydraulic system 3, an electrical system and other supporting facilities;
the guide rail is arranged below the inner support at the bottommost part of the cofferdam and close to the edge angle;
the omnibearing self-propelled high-pressure injection soil sampling equipment is arranged on a guide rail and travels along the rail through a driving device;
the monitoring system is characterized in that a sensor is arranged at each part of the equipment according to functions, and other equipment is arranged on a temporarily-erected operation platform in the cofferdam;
the hydraulic system, the electrical system and other supporting facilities are arranged on an operation platform temporarily erected in the cofferdam.
The above is only a preferred embodiment of the present invention, and certainly, the scope of the present invention should not be limited thereby, and therefore, the present invention is not limited by the scope of the claims.
Claims (9)
1. The utility model provides a be used for whole subsiding auxiliary assembly of open caisson and cofferdam class structure, a serial communication port, including running gear, all-round self-propelled high-pressure injection geotome and monitoring system, all-round self-propelled high-pressure injection geotome sets up on running gear, and all-round self-propelled high-pressure injection geotome's lower extreme stretches into to the below of open caisson or cofferdam, and pressure sensor has been laid to the lower extreme of open caisson or cofferdam, and monitoring system is connected with pressure sensor.
2. The integral sinking auxiliary device for the open caisson and cofferdam structure as claimed in claim 1, wherein the omnibearing self-propelled high-pressure jet soil sampling device comprises a drill rod, an air compressor, a power device and a slurry pump, the lower end of the drill rod is provided with a front end slotting device, the power device is connected with the front end slotting device, the front end slotting device is used for cutting soil mass below the open caisson or the cofferdam, the drill rod is internally provided with a slurry discharge channel, a water jet hole and a main air hole, the main air hole is connected with the air compressor, the water jet hole is connected with a high-pressure water pump, and the slurry pump is connected with the slurry discharge channel.
3. The auxiliary equipment for the integral sinking of the open caisson and the cofferdam structure as claimed in claim 2, wherein the drill rod is further internally provided with a slurry discharge port, a slurry discharge water inlet hole and a slurry discharge air inlet hole, and the slurry discharge port, the slurry discharge water inlet hole and the slurry discharge air inlet hole are communicated with the slurry discharge channel; water and air are injected into the slurry discharge channel through the slurry discharge water inlet hole and the slurry discharge air inlet hole, and slurry sucked from the slurry discharge port is discharged to the outside from the slurry discharge pipeline.
4. The auxiliary equipment for the integral sinking of the open caisson and cofferdam like structure as claimed in claim 1, wherein the pressure sensor is arranged at the lower end of the omnibearing self-propelled high-pressure jet borrowing equipment.
5. The auxiliary equipment for the integral sinking of the open caisson and the cofferdam structure as claimed in claim 1, wherein the walking mechanism comprises a guide rail and a driving device, the guide rail is transversely arranged along the inner wall of the open caisson or the cofferdam, a slide block is arranged on the guide rail, and the slide block is connected with the omnibearing self-propelled high-pressure jet soil-taking equipment;
the driving device comprises chain wheels, a chain and a driving motor, the chain wheels are arranged at two ends of the guide rail and are connected through the chain, the sliding block is connected with the chain, and the driving motor is connected with one of the chain wheels; the driving motor drives the chain wheel to rotate, and the all-dimensional self-propelled high-pressure injection soil sampling equipment is driven by the chain to move back and forth along the guide rail through the sliding block.
6. The auxiliary equipment for the integral sinking of the open caisson and cofferdam like structure as claimed in claim 5, wherein the chain and the chain wheel are replaced by wire rope and wire belt wheel.
7. The auxiliary equipment for the integral sinking of the open caisson and cofferdam structure as claimed in claim 1, wherein the power device is fixedly arranged on the drill rod, the power device comprises an electric motor or a hydraulic motor, and the electric motor or the hydraulic pressure is connected with the front end slotting equipment; and power is provided for the front end slotting equipment.
8. The integral auxiliary equipment for sinking of open caisson and cofferdam like structure of claim 1 wherein the front end trenching equipment comprises drill bit and/or ditcher.
9. A construction method using the integral sinking auxiliary equipment for the open caisson and cofferdam structure of claim 1, characterized by comprising the following steps:
1) sinking by self weight in the modes of water injection, heightening and the like in the cofferdam until the cofferdam cannot sink by self weight;
2) starting the omnibearing self-propelled high-pressure jet soil sampling equipment, cutting the soil body at the bottom of the edge angle of the cofferdam and sucking out the cut soil body, so that the resistance at the end part of the cofferdam is reduced, and the sinking speed of the cofferdam is accelerated;
3) and after the cofferdam is sunk in place, taking out the auxiliary sinking equipment, sealing the bottom of the cofferdam and starting foundation construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209269.2A CN112281672A (en) | 2020-11-03 | 2020-11-03 | Auxiliary equipment for integral sinking of open caisson and cofferdam structure and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011209269.2A CN112281672A (en) | 2020-11-03 | 2020-11-03 | Auxiliary equipment for integral sinking of open caisson and cofferdam structure and construction method |
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| Publication Number | Publication Date |
|---|---|
| CN112281672A true CN112281672A (en) | 2021-01-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011209269.2A Pending CN112281672A (en) | 2020-11-03 | 2020-11-03 | Auxiliary equipment for integral sinking of open caisson and cofferdam structure and construction method |
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| CN (1) | CN112281672A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737592A (en) * | 2022-04-12 | 2022-07-12 | 交通运输部上海打捞局 | Chain bucket type end plate auxiliary sinking system suitable for box type end plate |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61296207A (en) * | 1985-06-25 | 1986-12-27 | Oyo Keisoku Kogyo Kk | Method for measuring subsidence and inclination of caisson at time of construction |
| CN101205721A (en) * | 2007-12-03 | 2008-06-25 | 中铁大桥局集团第四工程有限公司 | Method for surrounding water by combination of steel cofferdam and heavy-pressure rotary-spraying pile in deep-water low-pile cap construction |
| CN109339096A (en) * | 2018-07-02 | 2019-02-15 | 刘德堃 | A kind of construction integrated constructing device of pipe gallery open cut precast assembly and its construction method |
| CN109853603A (en) * | 2019-03-05 | 2019-06-07 | 中交第二航务工程局有限公司 | Pneumatic caisson excavating device and its application method |
| CN210066788U (en) * | 2019-04-16 | 2020-02-14 | 中国铁建大桥工程局集团有限公司 | Reverse circulation water jetting mud suction machine |
-
2020
- 2020-11-03 CN CN202011209269.2A patent/CN112281672A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61296207A (en) * | 1985-06-25 | 1986-12-27 | Oyo Keisoku Kogyo Kk | Method for measuring subsidence and inclination of caisson at time of construction |
| CN101205721A (en) * | 2007-12-03 | 2008-06-25 | 中铁大桥局集团第四工程有限公司 | Method for surrounding water by combination of steel cofferdam and heavy-pressure rotary-spraying pile in deep-water low-pile cap construction |
| CN109339096A (en) * | 2018-07-02 | 2019-02-15 | 刘德堃 | A kind of construction integrated constructing device of pipe gallery open cut precast assembly and its construction method |
| CN109853603A (en) * | 2019-03-05 | 2019-06-07 | 中交第二航务工程局有限公司 | Pneumatic caisson excavating device and its application method |
| CN210066788U (en) * | 2019-04-16 | 2020-02-14 | 中国铁建大桥工程局集团有限公司 | Reverse circulation water jetting mud suction machine |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114737592A (en) * | 2022-04-12 | 2022-07-12 | 交通运输部上海打捞局 | Chain bucket type end plate auxiliary sinking system suitable for box type end plate |
| CN114737592B (en) * | 2022-04-12 | 2023-09-29 | 交通运输部上海打捞局 | Chain bucket type end plate auxiliary sinking system applicable to box type end plate |
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Application publication date: 20210129 |