CN110670611A - Inner support assembly type multilayer integral installation method for deep water foundation steel sheet pile cofferdam - Google Patents
Inner support assembly type multilayer integral installation method for deep water foundation steel sheet pile cofferdam Download PDFInfo
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- CN110670611A CN110670611A CN201910936765.9A CN201910936765A CN110670611A CN 110670611 A CN110670611 A CN 110670611A CN 201910936765 A CN201910936765 A CN 201910936765A CN 110670611 A CN110670611 A CN 110670611A
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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
- 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
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Abstract
The invention discloses an inner support assembly type multilayer integral installation method for a deep water foundation steel sheet pile cofferdam. The inner support is prefabricated into the assembled multilayer integral inner support and then is placed downwards for positioning, so that the construction efficiency of site construction is greatly improved, and the difficulty of site construction is reduced.
Description
Technical Field
The invention relates to the field of steel sheet pile cofferdam construction, in particular to an inner support assembly type multilayer integral installation method for a deep water foundation steel sheet pile cofferdam.
Background
The bridge deepwater foundation is a foundation which is built in deepwater on a river (river) and has urgent water depth and weak foundation, and the changeable and complex deepwater environment can bring some special problems to the design theory and construction technology of the foundation, so that the bridge deepwater foundation is always the key point of the bridge engineering technology research in China. The selection of the construction method of the bridge deepwater foundation has great influence on the magnitude of engineering risks, the construction period and the construction cost, and the design of an overwater temporary structure and construction control measures are the key of success and failure of deepwater foundation construction.
The common structure of the underwater cofferdam mainly comprises: the cofferdam comprises a steel sheet pile cofferdam, a concrete cofferdam, a steel box cofferdam, a lock catch steel pipe pile cofferdam, a steel-concrete combined structure cofferdam and the like. The steel sheet pile cofferdam is a more traditional underwater foundation construction method, is widely applied to the foundation construction of the riverside and shallow water bridges in China, and has the advantages of protective structure, water stopping function and relatively flexible use conditions due to the design form of the occluded lock catch. The steel sheet pile cofferdam generally adopts the structural style of single-wall rectangle, circle, etc., and the inside is provided with an inner support according to the water level condition. The steel sheet pile can be pulled out for reuse, and is a cofferdam form with simple and rapid construction and lower cost.
For the deep water foundation steel sheet pile cofferdam, the construction of the conventional steel sheet pile cofferdam is that the inner supports of each channel are assembled and welded on site, and the construction tasks of the bearing platform and the pier body in water cannot be completed quickly in the flood season.
Disclosure of Invention
The invention aims to solve the technical problem of providing an assembly type multilayer integral installation method for an inner support of a deep water foundation steel sheet pile cofferdam, wherein the inner support is prefabricated into the assembly type multilayer integral inner support and then is placed down for positioning, so that the construction efficiency of site construction is greatly improved, and the difficulty of site construction is reduced.
The technical scheme of the invention is as follows:
an internal support assembly type multilayer integral installation method for a deep water foundation steel sheet pile cofferdam specifically comprises the following steps:
(1) after the steel sheet piles are inserted, driven and folded, mud is sucked in the cofferdam to be below the inner support at the bottommost layer, so that the inner support is ensured to be smoothly lowered in place;
(2) in a plurality of bored pile steel pile casings in the cofferdam, a circle of corbel is welded on the outer wall, close to the top end, of the outermost circle of bored pile steel pile casing, the upper end face of the circle of corbel serves as a supporting face for an inner support to lower the temporary platform, the circle of corbel is positioned on the periphery of the outermost circle of bored pile steel pile casing, and a cross-shaped support reinforcing structure is welded on the inner wall of the bored pile steel pile casing and at the horizontal plane where the corbel is welded with the outer wall of the bored pile steel pile casing;
(3) the prefabricated multilayer integral inner support is transported to a bridge site by adopting a flat-bed ship after welding forming, flaw detection and anticorrosive coating are carried out on the back site in advance;
(4) hoisting the assembled multilayer integral inner support to a supporting surface of an inner support lowering temporary platform by adopting a floating crane, wherein the top end of the assembled multilayer integral inner support is lower than the top ends of a plurality of bored pile steel casings in a cofferdam, erecting and installing an inner support hoisting system at the top ends of the plurality of bored pile steel casings in the cofferdam, connecting a plurality of bearing suspenders of the inner support hoisting system with the top end of the assembled multilayer integral inner support, then dismantling a ring of corbels welded on the bored pile steel casings, and finally moving the bearing suspenders downwards step by step after the inner support hoisting system is started until the assembled multilayer integral inner support is lowered to a designed elevation position and hoisted by adopting a suspender with the top end fixed at the top end of a steel sheet pile;
(5) the self-locking combined wedge-shaped shoveling cushion block is arranged in a gap between an outer ring of each inner support of the assembled multilayer integral inner support and a steel sheet pile, the self-locking combined wedge-shaped shoveling cushion block comprises an upper wedge-shaped block and a lower wedge-shaped block, the inclined plane of the upper wedge-shaped block faces downwards in an inclined mode, the inclined plane of the lower wedge-shaped block faces upwards in an inclined mode, the inclined plane of the upper wedge-shaped block is parallel to and opposite to the inclined plane of the lower wedge-shaped block, the lower wedge-shaped block is connected to the outer ring of the corresponding inner support, and the upper wedge-shaped block is supported on the lower wedge-shaped block;
(6) and after the assembly type multilayer integral inner support in the cofferdam is installed in place, carrying out underwater mud suction, bottom sealing and water pumping work on the cofferdam, finally completing the construction tasks of the bearing platform and the pier body, and dismantling the cofferdam.
The bracket including supporting beam and bracing roof beam, supporting beam's one end and the top welding of bracing roof beam form the bracket, the bottom of the other end of supporting beam, bracing roof beam welds on corresponding bored pile steel protects the outer wall of a section of thick bamboo, bored pile steel protect on the section of thick bamboo inner wall and be located supporting beam and bored pile steel and protect a horizontal plane department, bracing roof beam and bored pile steel that a section of thick bamboo outer wall welding position protected a horizontal plane department of outer wall welding position and all welded the cross and prop reinforced structure.
The assembled multilayer integral inner support comprises an inner support which is horizontally arranged from bottom to top, and the inner supports are parallel up and down and connected into the assembled multilayer integral inner support through interlayer trusses.
The whole interior support of assembled multilayer including five, support for the whole interior support of assembled under for the whole interior support of assembled from supreme three times down, support for the whole interior support of assembled under for the whole interior support of assembled from last two times down, the top welding of the whole interior support of assembled has the interlayer truss down under, when the whole interior support of assembled multilayer is transferred, at first transfer the whole interior support of assembled under to design elevation position, then transfer the whole interior support of assembled under to the whole interior support of assembled, when the cofferdam is pumped water to the second and is supported the end opening in the way, support the interlayer truss welded fastening on top of the whole interior support of assembled and assembled under again.
The supporting and hanging system comprises bearing beams, counter-force distribution beams, center-penetrating lifting jacks and bearing hanging rods, wherein the bearing beams are arranged on the tops of a plurality of bored pile steel pile casings in the cofferdam in a parallel mode, the counter-force distribution beams are fixed at the two ends of each bearing beam, the center-penetrating lifting jacks are fixed on each counter-force distribution beam, the bottoms of the bearing hanging rods sequentially penetrate the center-penetrating lifting jacks from top to bottom, the bearing hanging rods of the counter-force distribution beams and the bearing beams are connected with the bottom end of each bearing hanging rod, the center-penetrating lifting jacks on each counter-force distribution beam drive the bearing hanging rods to gradually move downwards until the assembled multilayer integral inner supports are placed to the designed elevation position.
The self-locking combined wedge-shaped shoveling cushion block is characterized in that an inverted L-shaped lug is connected to a lower wedge-shaped block, the vertical part of the inverted L-shaped lug is parallel to the vertical side face, adjacent to an inner support, of the lower wedge-shaped block, the horizontal part of the inverted L-shaped lug is fixedly connected to the upper end face of the lower wedge-shaped block, a clamping groove is formed between the vertical part of the inverted L-shaped lug and the lower wedge-shaped block, and when the lower wedge-shaped block is connected with the corresponding inner support, the clamping groove formed between the inverted L-shaped lug and the lower wedge-shaped block is clamped on the top end of the inner support.
The invention has the advantages that:
(1) each inner support is prefabricated and connected into an assembled multilayer integral inner support on the back field and is directly hoisted into a cofferdam steel sheet pile for installation, so that the construction efficiency of site construction is greatly improved, and the difficulty of site construction is reduced;
(2) according to the invention, a circle of corbels are welded at the top end of the steel casing of the drilled pile, a temporary storage platform is provided for lowering the assembled multilayer integral internal support, and a cross brace reinforcing structure is welded at a corresponding position in the steel casing of the drilled pile, so that the rigidity of the steel casing support of the drilled pile is greatly improved;
(3) the self-locking combined wedge-shaped shoveling cushion blocks with adjustable functions are arranged in the gap between each inner support and the steel sheet pile, so that the shoveling cushion is compact, the deformation of the steel sheet pile in the process of absorbing mud and pumping water of the cofferdam is reduced, and the safety of cofferdam construction is ensured.
Drawings
Fig. 1 is a schematic structural diagram of a corbel and a cross brace reinforcing structure welded on a steel casing of a bored pile.
Fig. 2 is a top view of the corbel and cross brace reinforcing structure of the invention welded to a steel casing of a bored pile.
Fig. 3 is a schematic structural diagram of the assembled integral lower inner support temporary support on the inner support lowering temporary platform.
FIG. 4 is a schematic structural view of the support hanger system of the present invention.
FIG. 5 is a schematic structural diagram of the self-locking combined wedge-shaped shoveling block.
Fig. 6 is a schematic structural view of the steel sheet pile cofferdam of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-6, the method for integrally installing the fabricated multilayer inner support in the deep water foundation steel sheet pile cofferdam specifically comprises the following steps:
(1) after the steel sheet piles 1 are inserted, beaten and folded, mud is sucked in the cofferdam to be below the inner support at the bottommost layer, and the inner support is ensured to be smoothly put down in place;
(2) in a plurality of bored pile steel casing 2 in the cofferdam, a ring of bracket 3 (shown in figures 1 and 2) is welded on the outer wall of the outermost ring of bored pile steel casing 1 near the top end, the bracket 3 comprises a supporting beam 31 and an inclined strut beam 32, one end of the supporting beam 31 and the top end of the inclined strut beam 32 are welded to form a bracket, the other end of the supporting beam 31 and the bottom end of the inclined strut beam 32 are welded on the outer wall of the corresponding bored pile steel casing 1, the upper end face of the ring of bracket supporting beam 31 is used as the supporting face of an inner support lowering temporary platform, and cross brace reinforcing structures 4 (shown in figures 1 and 2) are welded on the inner wall of the bored pile steel casing 1, positioned at the horizontal plane of the welding position of the supporting beam 31 and the outer wall of the bored pile steel casing 1 and at the horizontal plane of the welding position of the inclined strut beam 32 and the outer wall of the bored pile steel;
(3) the prefabricated multilayer integral inner support 5 is welded and formed, flaw detection and anticorrosive coating at the back site in advance, the prefabricated multilayer integral inner support comprises five horizontally arranged inner supports from bottom to top, the five inner supports are parallel from top to bottom and are connected into the prefabricated multilayer integral inner support through interlayer trusses, the three inner supports from bottom to top are the prefabricated integral lower inner support, the interlayer trusses are welded at the top ends of the prefabricated integral lower inner support, the two inner supports from top to bottom are the prefabricated integral upper inner support, and the prefabricated integral lower inner support 51 and the prefabricated integral upper inner support are floated to a bridge site by using a flat-plate ship;
(4) firstly, hoisting an assembled integral lower inner support 51 to a supporting surface of an inner support lowering temporary platform by adopting a floating crane, wherein the top end of the assembled integral lower inner support 51 is lower than the top ends of a plurality of bored pile steel casings in a cofferdam, erecting and installing an inner support suspension system 6 at the top ends of the plurality of bored pile steel casings in the cofferdam, the support suspension system 6 comprises a plurality of bearing beams 61 erected on the top ends of the plurality of bored pile steel casings in the cofferdam in parallel, reaction force distribution beams 62 fixed on the two ends of each bearing beam 61, a center-penetrating lifting jack 63 fixed on each reaction force distribution beam 62, and bearing suspenders 64 with the bottom ends sequentially penetrating through the center-penetrating lifting jack 63, the reaction force distribution beams 62 and the bearing suspenders 61 from top to bottom, wherein the bottom end of each bearing suspender 64 is connected with the top end of the assembled integral lower inner support 51, then dismantling a circle of corbels 3 on the bored pile steel casings 1, finally, after the inner support hanging system 7 is started, the bearing hanger rods 54 gradually move downwards until the assembled integral lower inner supports 51 are lowered to the designed elevation position and hung by the hanger rods with the top ends fixed at the top ends of the steel sheet piles 1; then when the cofferdam is pumped to the bottom opening of the second internal support, lowering the assembled integral upper internal support onto the assembled integral lower internal support 51 by adopting a floating crane according to the steps, and then welding and fixing the assembled integral upper internal support and an interlayer truss at the top end of the assembled integral lower internal support 51 to form an assembled multilayer integral internal support 5;
(5) a self-locking combined wedge-shaped shoveling block (shown in the figure) is arranged in a gap between an outer ring of each inner support of the assembled multi-layer integral inner support and the steel sheet pile 1, the self-locking combined wedge-shaped shoveling block comprises an upper wedge-shaped block 71 and a lower wedge-shaped block 72, the inclined plane of the upper wedge-shaped block 71 is inclined downwards, the inclined plane of the lower wedge-shaped block 72 is inclined upwards, the inclined plane of the upper wedge-shaped block 71 is parallel and opposite to the inclined plane of the lower wedge-shaped block 72, the lower wedge-shaped block 72 is connected to the outer ring of the corresponding inner support, and the upper wedge-shaped block 71 is supported on the lower wedge-shaped;
(6) and (6) after the assembly type multilayer integral inner support 4 in the cofferdam is installed in place, carrying out underwater mud suction, bottom sealing and water pumping work on the cofferdam, finally completing the construction tasks of a bearing platform and a pier body, and dismantling the cofferdam.
The lower wedge-shaped block 72 of the self-locking combined wedge-shaped shoveling block is connected with an inverted L-shaped hanging lug 73, the vertical part of the inverted L-shaped hanging lug 73 is parallel to the vertical side face of the lower wedge-shaped block 72, which is adjacent to the inner support, the horizontal part of the inverted L-shaped hanging lug 73 is fixedly connected to the upper end face of the lower wedge-shaped block 72, a clamping groove is formed between the vertical part of the inverted L-shaped hanging lug 73 and the lower wedge-shaped block 72, and when the lower wedge-shaped block 72 is connected with the corresponding inner support, the clamping groove formed between the inverted L-shaped hanging lug 73 and the lower wedge-shaped block 72 is clamped on the top end.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An inner support assembly type multilayer integral installation method for a deep water foundation steel sheet pile cofferdam is characterized in that: the method specifically comprises the following steps:
(1) after the steel sheet piles are inserted, driven and folded, mud is sucked in the cofferdam to be below the inner support at the bottommost layer, so that the inner support is ensured to be smoothly lowered in place;
(2) in a plurality of bored pile steel pile casings in the cofferdam, a circle of corbel is welded on the outer wall, close to the top end, of the outermost circle of bored pile steel pile casing, the upper end face of the circle of corbel serves as a supporting face for an inner support to lower the temporary platform, the circle of corbel is positioned on the periphery of the outermost circle of bored pile steel pile casing, and a cross-shaped support reinforcing structure is welded on the inner wall of the bored pile steel pile casing and at the horizontal plane where the corbel is welded with the outer wall of the bored pile steel pile casing;
(3) the prefabricated multilayer integral inner support is transported to a bridge site by adopting a flat-bed ship after welding forming, flaw detection and anticorrosive coating are carried out on the back site in advance;
(4) hoisting the assembled multilayer integral inner support to a supporting surface of an inner support lowering temporary platform by adopting a floating crane, wherein the top end of the assembled multilayer integral inner support is lower than the top ends of a plurality of bored pile steel casings in a cofferdam, erecting and installing an inner support hoisting system at the top ends of the plurality of bored pile steel casings in the cofferdam, connecting a plurality of bearing suspenders of the inner support hoisting system with the top end of the assembled multilayer integral inner support, then dismantling a ring of corbels welded on the bored pile steel casings, and finally moving the bearing suspenders downwards step by step after the inner support hoisting system is started until the assembled multilayer integral inner support is lowered to a designed elevation position and hoisted by adopting a suspender with the top end fixed at the top end of a steel sheet pile;
(5) the self-locking combined wedge-shaped shoveling cushion block is arranged in a gap between an outer ring of each inner support of the assembled multilayer integral inner support and a steel sheet pile, the self-locking combined wedge-shaped shoveling cushion block comprises an upper wedge-shaped block and a lower wedge-shaped block, the inclined plane of the upper wedge-shaped block faces downwards in an inclined mode, the inclined plane of the lower wedge-shaped block faces upwards in an inclined mode, the inclined plane of the upper wedge-shaped block is parallel to and opposite to the inclined plane of the lower wedge-shaped block, the lower wedge-shaped block is connected to the outer ring of the corresponding inner support, and the upper wedge-shaped block is supported on the lower wedge-shaped block;
(6) and after the assembly type multilayer integral inner support in the cofferdam is installed in place, carrying out underwater mud suction, bottom sealing and water pumping work on the cofferdam, finally completing the construction tasks of the bearing platform and the pier body, and dismantling the cofferdam.
2. The method for integrally installing the fabricated multilayer in the deep water foundation steel sheet pile cofferdam according to claim 1, characterized in that: the bracket including supporting beam and bracing roof beam, supporting beam's one end and the top welding of bracing roof beam form the bracket, the bottom of the other end of supporting beam, bracing roof beam welds on corresponding bored pile steel protects the outer wall of a section of thick bamboo, bored pile steel protect on the section of thick bamboo inner wall and be located supporting beam and bored pile steel and protect a horizontal plane department, bracing roof beam and bored pile steel that a section of thick bamboo outer wall welding position protected a horizontal plane department of outer wall welding position and all welded the cross and prop reinforced structure.
3. The method for integrally installing the fabricated multilayer in the deep water foundation steel sheet pile cofferdam according to claim 1, characterized in that: the assembled multilayer integral inner support comprises an inner support which is horizontally arranged from bottom to top, and the inner supports are parallel up and down and connected into the assembled multilayer integral inner support through interlayer trusses.
4. The method for integrally installing the fabricated multilayer in the deep water foundation steel sheet pile cofferdam according to claim 3, characterized in that: the whole interior support of assembled multilayer including five, support for the whole interior support of assembled under for the whole interior support of assembled from supreme three times down, support for the whole interior support of assembled under for the whole interior support of assembled from last two times down, the top welding of the whole interior support of assembled has the interlayer truss down under, when the whole interior support of assembled multilayer is transferred, at first transfer the whole interior support of assembled under to design elevation position, then transfer the whole interior support of assembled under to the whole interior support of assembled, when the cofferdam is pumped water to the second and is supported the end opening in the way, support the interlayer truss welded fastening on top of the whole interior support of assembled and assembled under again.
5. The method for integrally installing the fabricated multilayer in the deep water foundation steel sheet pile cofferdam according to claim 1, characterized in that: the supporting and hanging system comprises bearing beams, counter-force distribution beams, center-penetrating lifting jacks and bearing hanging rods, wherein the bearing beams are arranged on the tops of a plurality of bored pile steel pile casings in the cofferdam in a parallel mode, the counter-force distribution beams are fixed at the two ends of each bearing beam, the center-penetrating lifting jacks are fixed on each counter-force distribution beam, the bottoms of the bearing hanging rods sequentially penetrate the center-penetrating lifting jacks from top to bottom, the bearing hanging rods of the counter-force distribution beams and the bearing beams are connected with the bottom end of each bearing hanging rod, the center-penetrating lifting jacks on each counter-force distribution beam drive the bearing hanging rods to gradually move downwards until the assembled multilayer integral inner supports are placed to the designed elevation position.
6. The method for integrally installing the fabricated multilayer in the deep water foundation steel sheet pile cofferdam according to claim 1, characterized in that: the self-locking combined wedge-shaped shoveling cushion block is characterized in that an inverted L-shaped lug is connected to a lower wedge-shaped block, the vertical part of the inverted L-shaped lug is parallel to the vertical side face, adjacent to an inner support, of the lower wedge-shaped block, the horizontal part of the inverted L-shaped lug is fixedly connected to the upper end face of the lower wedge-shaped block, a clamping groove is formed between the vertical part of the inverted L-shaped lug and the lower wedge-shaped block, and when the lower wedge-shaped block is connected with the corresponding inner support, the clamping groove formed between the inverted L-shaped lug and the lower wedge-shaped block is clamped on the top end of the inner support.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910936765.9A CN110670611A (en) | 2019-09-29 | 2019-09-29 | Inner support assembly type multilayer integral installation method for deep water foundation steel sheet pile cofferdam |
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| CN201910936765.9A CN110670611A (en) | 2019-09-29 | 2019-09-29 | Inner support assembly type multilayer integral installation method for deep water foundation steel sheet pile cofferdam |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309126A (en) * | 2021-07-06 | 2021-08-27 | 中铁十六局集团第三工程有限公司 | Steel sheet pile cofferdam supporting device |
| CN113756346A (en) * | 2021-09-29 | 2021-12-07 | 中铁广州工程局集团有限公司 | Construction method of combined cofferdam for shallow overburden hard bedrock deep water deep foundation pit |
| CN114277817A (en) * | 2021-12-17 | 2022-04-05 | 中铁广州工程局集团有限公司 | Construction method for integrally and synchronously laying multi-layer large-tonnage inner supports in cofferdam |
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| US8066449B2 (en) * | 2002-07-18 | 2011-11-29 | Aubian Engineering, Inc. | Method for dry isolation of a water passage of a dam |
| CN106013192A (en) * | 2016-06-15 | 2016-10-12 | 中铁港航局集团有限公司 | Method of constructing cofferdam after integrally lowering multiple layers of inner bracings of steel sheet pile cofferdam |
| CN205917702U (en) * | 2016-06-15 | 2017-02-01 | 中铁港航局集团有限公司 | Whole system of transferring of bridge deep basal pit steel sheet piling cofferdam internal stay |
| CN207685678U (en) * | 2017-11-24 | 2018-08-03 | 江苏中铁山桥重工有限公司 | A kind of big section assembling of bridge is with to spelling formula adjustable wedge block |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8066449B2 (en) * | 2002-07-18 | 2011-11-29 | Aubian Engineering, Inc. | Method for dry isolation of a water passage of a dam |
| CN106013192A (en) * | 2016-06-15 | 2016-10-12 | 中铁港航局集团有限公司 | Method of constructing cofferdam after integrally lowering multiple layers of inner bracings of steel sheet pile cofferdam |
| CN205917702U (en) * | 2016-06-15 | 2017-02-01 | 中铁港航局集团有限公司 | Whole system of transferring of bridge deep basal pit steel sheet piling cofferdam internal stay |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113309126A (en) * | 2021-07-06 | 2021-08-27 | 中铁十六局集团第三工程有限公司 | Steel sheet pile cofferdam supporting device |
| CN113756346A (en) * | 2021-09-29 | 2021-12-07 | 中铁广州工程局集团有限公司 | Construction method of combined cofferdam for shallow overburden hard bedrock deep water deep foundation pit |
| CN114277817A (en) * | 2021-12-17 | 2022-04-05 | 中铁广州工程局集团有限公司 | Construction method for integrally and synchronously laying multi-layer large-tonnage inner supports in cofferdam |
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