CN112031005B - Cofferdam assembly system of underwater pile foundation - Google Patents
Cofferdam assembly system of underwater pile foundation Download PDFInfo
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- CN112031005B CN112031005B CN202010801454.4A CN202010801454A CN112031005B CN 112031005 B CN112031005 B CN 112031005B CN 202010801454 A CN202010801454 A CN 202010801454A CN 112031005 B CN112031005 B CN 112031005B
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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
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
- E02D3/106—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains by forming sand drains containing only loose aggregates
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/06—Fitted piles or other elements specially adapted for closing gaps between two sheet piles or between two walls of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Agronomy & Crop Science (AREA)
- Environmental & Geological Engineering (AREA)
- Soil Sciences (AREA)
- Revetment (AREA)
Abstract
The invention relates to a cofferdam assembly system of an underwater pile foundation, aiming at a temporarily built cofferdam for building permanent water conservancy facilities and a construction method thereof, wherein the cofferdam comprises a plurality of positioning cones, a plurality of foundation cylinders and a plurality of partition plates; the positioning cone is implanted into a rock stratum through the static-pressure pile planting machine, the base cylinders are installed above the positioning cone, the base cylinders are connected through the partition plates, and the filter screen is movably installed on the partition plates. The invention has the advantages of stable structure and modular unit type installation.
Description
Technical Field
The invention relates to the technical field of underwater pile foundation construction, in particular to a cofferdam assembly system of an underwater pile foundation.
Background
The construction of the underwater pile foundation is obviously more complex and difficult than the construction of a dry land, and particularly the construction of the pile foundation in the deep water and torrent river sea is more difficult. In order to adapt to the environment of underwater construction, floating driven piles and related equipment are inevitably added, and a special underwater construction method is adopted. At present, methods such as a cofferdam method, a hanging box method, a box casing method, an open caisson combined method and the like are commonly adopted for construction of underwater pile foundations in deep water, wherein the cofferdam method is the most commonly used method, a steel sheet pile cofferdam is most commonly adopted for construction in the cofferdam method, the steel sheet pile cofferdam has certain limitation, and the steel sheet pile cofferdam is not suitable for being used in riverbeds or seabed with large boulders and hard rocks, so that the design provides a cofferdam assembly system of the underwater pile foundations which is suitable for multiple terrains and multiple scenes and has low construction difficulty.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, adapt to practical requirements and provide a cofferdam assembly system of an underwater pile foundation so as to meet the requirements under various environments.
In order to realize the aim of the invention, the cofferdam assembly system of the underwater pile foundation is designed, which comprises a plurality of positioning cones, a plurality of base cylinders and a plurality of partition plates; as shown in fig. 1, the positioning cone is a cone, the base cylinder is welded to the positioning cone and located above the positioning cone, the positioning cone applies pressure to the base cylinder through a static pressure pile-planting machine so as to implant the base cylinder and the positioning cone into the bottom of a river bed or a sea bed, the partition plate is installed between two adjacent base cylinders to form a closed area, and the partition plate and the base cylinders are stacked up and down according to the depth of the river bed or the sea bed.
Particularly, the positioning cone has the effect that when the positioning cone and the foundation cylinder are implanted into a riverbed or a seabed, the cone head of the positioning cone can help to break a rock layer, a soil layer and the like better, so that the power consumption of the static pressure pile planting machine is reduced, and energy is saved more.
As shown in fig. 2, the base cylinder is tube-shape and inside cavity, just base cylinder both sides are equipped with the rectangle arch that the symmetry set up respectively, the rectangle arch with the base cylinder is coaxial and isometric, be equipped with "T" shape spout that runs through the protruding both ends of rectangle on the protruding lateral wall of rectangle, the bellied inboard of rectangle still is equipped with the through-hole, the through-hole also runs through the protruding setting of rectangle, "T" shape spout inside wall is equipped with a plurality of glue injection holes, glue injection hole with the through-hole intercommunication.
As shown in fig. 3 and 4, the partition board is plate-shaped, T-shaped protrusions are respectively disposed on the end portions of the two sides of the partition board and the front side wall and the rear side wall of the end portions of the two sides of the partition board, one of the T-shaped protrusions on one end of the partition board slides up and down in the T-shaped sliding groove, the partition board is connected with the base cylinder by the cooperation of the T-shaped protrusion and the T-shaped sliding groove, and a conical protrusion is further disposed on the lower portion of the partition board, as shown in fig. 5, the conical protrusion is disposed to: the conical projection 4 can better penetrate the rock layer or the earth layer through the lowest partition plate 12, so that the cofferdam system is better sealed.
Referring to fig. 6 and 7, the T-shaped protrusions formed on three sides of the end of each partition board allow the partition boards to be connected with the base cylinder in a diversified manner, that is, the partition boards and the base cylinder can be connected in a straight line or in a vertical corner, so that the partition boards and the base cylinder do not need to be connected by a special connecting piece when the corner is needed. Moreover, the sliding connection between the partition board and the base cylinder is simple in connection, convenient and fast, and high in durability.
Referring to fig. 8, the inside wall of the base cylinder is further provided with a plurality of filter holes, and the filter holes are arranged to aim at: when the cofferdam carries out the drainage, inside sewage uses the drain pump discharge via the inside cavity of base cylinder through the filtration pore, just can deposit to base cylinder bottom at the inside silt of cofferdam of original deposit, and sewage has carried out preliminary purification, easily extracts, and its inside mud of cofferdam water extraction back obtains remaining and extrusion secondly for the later stage is when needs are filled base cylinder inside, can practice thrift the filler in later stage, and then still saved manpower, material resources from the side.
As shown in fig. 9, the side wall of the uppermost partition board is further provided with two sliding grooves, the lower portions of the sliding grooves are provided with limiting holes, limiting bolts are installed in the limiting holes, the upper portions of the sliding grooves are further provided with pin holes, a construction platform is installed in the pin holes and comprises a bearing board and a support board, one end of the bearing board is provided with a pin shaft, the bearing board is hinged on the partition board by installing the pin shaft of the bearing board in the pin hole, the lower side of the bearing board is further provided with a group of hinge holes, one end of the support board is provided with a rotating shaft, the support board is hinged with the bearing board by installing the rotating shaft in the hinge holes, the other end of the support board is provided with two circular protrusions, the support board is connected with the partition board by the two circular protrusions, and the support board can slide up and down on a vertical plane along the side wall sliding grooves of the partition board, when the construction platform is unfolded, the bearing plate is flush with the upper end face of the partition plate, the limiting bolt is inserted into the limiting hole, and the construction platform is limited to slide downwards so as to be fixed.
The construction platform on the side edge of the partition plate not only increases the working area of the upper end of the cofferdam, but also facilitates the movement of constructors and provides a stacking platform for the installation of equipment materials and the like.
The invention has the beneficial effects that:
this cofferdam assembly system of pile foundation under water of design not only has the subassembly few and the equipment degree of difficulty is low, and the design of location awl makes this cofferdam system more stable firm in this design moreover, and the design of filtration pore still makes originally need draw out the silt of evacuation and can deposit in this cofferdam system bottom as the filler in this design, changing waste into valuables, further saving raw and other materials use amount.
Drawings
FIG. 1 is a schematic diagram of the overall structure of the present invention;
FIG. 2 is a schematic view of a base cylinder according to the present invention;
FIG. 3 is a schematic view of a separator plate according to the present invention;
FIG. 4 is a schematic view of the partition plate and the base cylinder according to the present invention;
FIG. 5 is a schematic view of the lowermost baffle of the present invention;
FIG. 6 is a schematic view of the partition plate and the base cylinder of FIG. 5 in a multi-angle fit;
FIG. 7 is a schematic cross-sectional view of the partition plate and the base cylinder of the present invention in multi-angle engagement;
FIG. 8 is a schematic view of a sludge layer foundation drum in the present invention;
FIG. 9 is a schematic view of the installation of the construction platform of the present invention.
Detailed Description
The invention is further illustrated with reference to the following figures and examples:
example 1: a cofferdam assembly system for underwater pile foundations, see figures 1 to 9.
Comprises a plurality of positioning cones 1, a plurality of base cylinders 2 and a plurality of clapboards 3.
As shown in fig. 1, the positioning cone 1 is a cone, the base cylinder 2 is welded to the positioning cone 1 and is located above the positioning cone 1, a static pressure pile-planting machine is used for applying pressure to the base cylinder 2 so as to plant the conjoined base cylinder 2 and the positioning cone 1 into the bottom of a river bed or a sea bed, the partition plate 12 is installed between two adjacent base cylinders 2 to form a closed area, and the partition plate 12 and the base cylinders 2 are stacked up and down according to the depth of the river bed or the sea bed.
Specifically, the positioning cone 1 has the function that when the positioning cone 1 and the foundation cylinder 2 are implanted under a river bed or a sea bed, the cone head of the positioning cone 1 can help the positioning cone 1 to better break rock layers, mud layers and the like.
As shown in fig. 2, base section of thick bamboo 2 is tube-shape and inside cavity 3, just base section of thick bamboo 2 both sides are equipped with the protruding 22 of rectangle that the symmetry set up respectively, protruding 22 of rectangle with base section of thick bamboo 2 is coaxial and isometric, be equipped with "T" shape spout 10 that runs through the protruding 22 both ends of rectangle on the protruding 22 lateral wall of rectangle, the inboard of the protruding 22 of rectangle still is equipped with through-hole 4, through-hole 4 also runs through the protruding 22 setting of rectangle, the 10 inside walls of "T" shape spout are equipped with a plurality of glue injection holes 9, glue injection hole 9 with through-hole 4 intercommunication.
As shown in fig. 3 and 4, the partition plate 12 is plate-shaped, T-shaped protrusions 11 are respectively disposed on the two side ends of the partition plate 12 and the front side wall and the rear side wall of the two side ends of the partition plate 12, one of the T-shaped protrusions 11 on one end of the partition plate 12 slides up and down in the T-shaped sliding groove 10, and the partition plate 12 is connected to the base cylinder 2 by the engagement of the T-shaped protrusion 11 and the T-shaped sliding groove 10.
Wherein, the lower part of the lowest partition plate 12 is further provided with a conical protrusion 13, as shown in fig. 5, the conical protrusion is provided for the purpose of: the conical projections 4 allow better access of the lowermost partition 12 to the rock or earth layer and thus better closure of the cofferdam system.
Referring to fig. 6 and 7, the T-shaped protrusions 11 formed on three sides of the end of the partition plate 3 allow the partition plate 12 to be connected with the base cylinder 2 in a diversified manner, i.e., the partition plate 12 and the base cylinder 2 can be connected in a straight line or in a vertical corner, so that the partition plate 12 and the base cylinder 2 do not need to be connected by a special connecting member when a corner is required. Moreover, the sliding connection between the partition plate 12 and the base cylinder 2 is simple, convenient and fast in connection and high in durability.
Referring to fig. 8, the inner side wall of the base cylinder 2 is provided with a plurality of filter holes 15, and the filter holes 15 are arranged to aim at: when the cofferdam carries out the drainage, inside sewage uses the drain pump discharge via the inside cavity 3 of base cylinder 2 through filtration pore 15, deposit just can deposit to base cylinder 2 bottoms at the inside silt of cofferdam originally, sewage has carried out preliminary purification, easily extraction, its inside mud obtains remaining and extrusion after the extraction of cofferdam internal water secondly, make the later stage when needs are filled base cylinder 2 insidely, can practice thrift the filling material in later stage, and then still saved manpower, material resources from the side.
As shown in fig. 9, be located the top baffle 12 lateral wall still is equipped with two spouts 21, spout 21 lower part is equipped with spacing hole 16, install spacing bolt 17 in spacing hole 16, spout 21 upper portion still is equipped with round pin shaft hole 23, install construction platform 14 in the round pin shaft hole 23, construction platform 14 includes loading board 6 and backup pad 7, loading board 6 one end is equipped with round pin axle 19, and through with the round pin axle 19 of loading board 6 is installed in round pin shaft hole 23 thereby will loading board 6 articulates on baffle 12, loading board 6 downside still is equipped with a set of hinge hole 20, backup pad 7 one end is equipped with pivot 5 and through with pivot 5 is installed make in the hinge hole 20 backup pad 7 with loading board 6 is articulated, the backup pad 7 other end is equipped with two circular archs 18, through two circular archs 18 install in the spout 21 and with backup pad 7 with baffle 12 is connected and makes The supporting plate 7 can slide up and down on a vertical plane along a sliding groove 21 on the side wall of the partition plate 12, when the construction platform is unfolded, the bearing plate 6 is flush with the upper end face of the partition plate 12, the limiting bolt 17 is inserted into the limiting hole 16, and the downward sliding of the construction platform 14 is limited, so that the construction platform 14 is fixed.
The construction platform on the side of the uppermost partition plate 12 not only increases the working area of the upper end of the cofferdam, but also facilitates the movement of constructors and provides a stacking platform for the installation of equipment materials and the like.
The specific use method of the device comprises the following steps:
firstly, the positioning cone 1 is welded and connected with a base cylinder 2 which is the lowest and is positioned in a riverbed or seabed silt layer, then connecting other base cylinders 2 to make the total length higher than the depth of water to be constructed, then sinking the conjoined positioning cone 1 and a plurality of base cylinders 2 into the river bed or the sea bed, and a static pressure pile planting machine applies pressure hammering to the uppermost base cylinder 2 so as to fix the connected base cylinders 2 and positioning cones 1 on the riverbed, then the partition plates 12 are arranged between the two base cylinders 2 from top to bottom one by one through the matching of the T-shaped sliding grooves 10 and the T-shaped bulges 11 and the hoisting of a crane, when the partition plates are installed one by one from top to bottom, the two adjacent partition plates 12 are fixed together by welding until the positioning cone 1, the base cylinder 2 and the partition plates 12 are installed to form a closed area with a required size as shown in fig. 1.
Secondly, after all the parts are installed, the construction platform on the side surface of the partition board 12 can be unfolded as follows:
firstly, the bearing plate 6 is turned upwards by using a crane, the lower end of the supporting plate 7 moves upwards along the sliding groove 21 in the process that the bearing plate 6 is turned upwards, when the lower end of the supporting plate 7 passes over the upper limiting hole 16 of the partition plate, the limiting bolt 17 is inserted and fixed, the bearing plate 6 is supported, at the moment, the construction platform 14 is unfolded and fixed, and a water pump and other materials can be placed on the construction platform 14 or a worker can step on the construction platform.
After each above-mentioned step is all accomplished, then need to carry out the drainage to this design, when the drainage, stretch into in each base section of thick bamboo 2 with the drinking-water pipe of suction pump, filter through filtration pore 15 on the 2 inside walls of base section of thick bamboo in with the cofferdam, then to base section of thick bamboo 2 put into the steel reinforcement cage and leading-in concrete can, then detect whether the cofferdam system of this design has the place of leaking, prevent to cause the influence because of leaking to later stage construction.
For the condition that produces the leaking after preventing the installation, all install the completion back at each part, thereby can use high-pressure filling pump to stretch into in this design through-hole 4 is right the baffle with thereby the gap of the contact surface of foundation column carries out the injecting glue and fills the risk that leaks that reduces this design, and concrete injecting glue process is as follows: firstly, a filling opening of a high-pressure filling pump extends into the bottom of the through hole 4 and fills the bottom of the through hole 4 with waterproof glue, the through hole 4 is communicated with the glue filling hole 9, the waterproof glue can enter a gap between the partition plate 12 and the base cylinder 2 through the glue filling hole 9 under the action of high pressure and fill the gap, and after the bottom filling is completed, the filling opening of the high-pressure filling pump is gradually and slowly lifted upwards until the gap and the through hole 4 are completely filled with the waterproof glue.
The embodiments of the present invention are disclosed as the preferred embodiments, but not limited thereto, and those skilled in the art can easily understand the spirit of the present invention and make various extensions and changes without departing from the spirit of the present invention.
Claims (1)
1. A cofferdam assembly system of an underwater pile foundation comprises a plurality of positioning cones, a plurality of base cylinders and a plurality of partition plates; the method is characterized in that: the positioning cone is a cone, the base cylinder is connected with the positioning cone in a welding mode and is positioned above the positioning cone, the positioning cone applies pressure to the base cylinder through a static pressure pile planting machine so that the base cylinder and the positioning cone are planted at the bottom of a river bed or a seabed, the partition plate is installed between every two adjacent base cylinders to form a closed area in a surrounding mode, and the partition plate and the base cylinders are stacked up and down according to the depth of the river bed or the seabed;
the base cylinder is cylindrical and has an inner cavity, rectangular bulges are symmetrically arranged on two sides of the base cylinder respectively, the rectangular bulges are coaxial and equal in length with the base cylinder, and T-shaped sliding grooves penetrating through two ends of the rectangular bulges are formed in the outer side walls of the rectangular bulges;
the partition board is in a plate shape, T-shaped bulges are further arranged on two sides of the partition board and arranged along three surfaces of the tail end of two sides of the partition board, one T-shaped bulge is arranged in the T-shaped sliding groove and can slide up and down, and the partition board is connected with the base cylinder through the matching of the T-shaped bulge and the T-shaped sliding groove;
the lower part of the clapboard positioned at the lowest part is provided with a conical bulge, and the side wall of the clapboard positioned at the uppermost part is provided with a construction platform;
the side wall of the partition plate positioned at the uppermost part is provided with two sliding grooves, the lower parts of the sliding grooves are provided with limiting holes, limiting bolts are installed in the limiting holes, the upper parts of the sliding grooves are also provided with pin shaft holes, and construction platforms are installed in the pin shaft holes;
the construction platform comprises a bearing plate and a supporting plate, wherein one end of the bearing plate is provided with a pin shaft, the bearing plate is hinged on the clapboard by installing the pin shaft of the bearing plate in the pin shaft hole, the lower side of the bearing plate is also provided with a group of hinge holes, one end of the supporting plate is provided with a rotating shaft, the supporting plate is hinged with the bearing plate by installing the rotating shaft in the hinge holes, the other end of the supporting plate is provided with two circular bulges, the supporting plate is connected with the clapboard through the two circular bulges and can slide up and down on a vertical plane along the sliding groove on the side wall of the clapboard, when the construction platform is unfolded, the bearing plate is flush with the upper end face of the partition plate, the limiting bolt is inserted into the limiting hole, and the construction platform is limited to slide downwards so as to be fixed;
the inner side of the rectangular protrusion is also provided with a through hole which also penetrates through the rectangular protrusion, the inner side wall of the T-shaped sliding chute is provided with a plurality of glue injection holes, and the glue injection holes are communicated with the through hole;
and a plurality of filter holes are formed in the inner side wall of the base cylinder in the closed area.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801454.4A CN112031005B (en) | 2020-08-11 | 2020-08-11 | Cofferdam assembly system of underwater pile foundation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010801454.4A CN112031005B (en) | 2020-08-11 | 2020-08-11 | Cofferdam assembly system of underwater pile foundation |
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| CN112031005A CN112031005A (en) | 2020-12-04 |
| CN112031005B true CN112031005B (en) | 2022-03-01 |
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| JPS59129940U (en) * | 1983-02-22 | 1984-08-31 | 新日本製鐵株式会社 | Steel pipe cell structure |
| JP2004197403A (en) * | 2002-12-18 | 2004-07-15 | Data Tou:Kk | Steel pipe sheet pile well foundation |
| CN102644290A (en) * | 2012-05-14 | 2012-08-22 | 中国十九冶集团有限公司 | Steel cofferdam construction method suitable for deep silt-layer bridge construction in shallow sea area |
| CN104213569A (en) * | 2014-10-01 | 2014-12-17 | 杜东升 | Bridge pier cofferdam integrated equipment and construction method thereof |
| CN204715381U (en) * | 2015-06-12 | 2015-10-21 | 浙江海洋学院 | A kind of shallow water Bridge Pier Construction cofferdam device |
| CN206581276U (en) * | 2017-02-22 | 2017-10-24 | 中国水利水电第十三工程局有限公司 | A kind of reinforcement steel sheet-pile cofferdam workbench |
| CN206916758U (en) * | 2017-07-05 | 2018-01-23 | 赵友全 | A kind of steel boxed cofferdam |
| CN207512744U (en) * | 2017-11-13 | 2018-06-19 | 中铁大桥局集团第四工程有限公司 | For the turnable bottom die platform device of underwater concreting construction |
| CN209620061U (en) * | 2019-01-07 | 2019-11-12 | 中交第二航务工程局有限公司 | Latch steel-pipe pile and I-shaped sheet pile combined cofferdam structure |
| CN210315581U (en) * | 2019-07-02 | 2020-04-14 | 广东晟丰建设工程有限公司 | Epoxy type steel pile convenient to install |
-
2020
- 2020-08-11 CN CN202010801454.4A patent/CN112031005B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59129940U (en) * | 1983-02-22 | 1984-08-31 | 新日本製鐵株式会社 | Steel pipe cell structure |
| JP2004197403A (en) * | 2002-12-18 | 2004-07-15 | Data Tou:Kk | Steel pipe sheet pile well foundation |
| CN102644290A (en) * | 2012-05-14 | 2012-08-22 | 中国十九冶集团有限公司 | Steel cofferdam construction method suitable for deep silt-layer bridge construction in shallow sea area |
| CN104213569A (en) * | 2014-10-01 | 2014-12-17 | 杜东升 | Bridge pier cofferdam integrated equipment and construction method thereof |
| CN204715381U (en) * | 2015-06-12 | 2015-10-21 | 浙江海洋学院 | A kind of shallow water Bridge Pier Construction cofferdam device |
| CN206581276U (en) * | 2017-02-22 | 2017-10-24 | 中国水利水电第十三工程局有限公司 | A kind of reinforcement steel sheet-pile cofferdam workbench |
| CN206916758U (en) * | 2017-07-05 | 2018-01-23 | 赵友全 | A kind of steel boxed cofferdam |
| CN207512744U (en) * | 2017-11-13 | 2018-06-19 | 中铁大桥局集团第四工程有限公司 | For the turnable bottom die platform device of underwater concreting construction |
| CN209620061U (en) * | 2019-01-07 | 2019-11-12 | 中交第二航务工程局有限公司 | Latch steel-pipe pile and I-shaped sheet pile combined cofferdam structure |
| CN210315581U (en) * | 2019-07-02 | 2020-04-14 | 广东晟丰建设工程有限公司 | Epoxy type steel pile convenient to install |
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| CN112031005A (en) | 2020-12-04 |
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