CN113482023B - Construction method of large double-wall steel cofferdam for Yangtze river shoal - Google Patents
Construction method of large double-wall steel cofferdam for Yangtze river shoal Download PDFInfo
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- CN113482023B CN113482023B CN202110814476.9A CN202110814476A CN113482023B CN 113482023 B CN113482023 B CN 113482023B CN 202110814476 A CN202110814476 A CN 202110814476A CN 113482023 B CN113482023 B CN 113482023B
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/40—Controlling or monitoring, e.g. of flood or hurricane; Forecasting, e.g. risk assessment or mapping
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Abstract
The invention discloses a construction method of a large double-wall steel cofferdam for a Yangtze river shoal, which comprises the following steps: the construction method comprises the steps of construction site plane arrangement, welding and supporting jig frames of steel cofferdam sections, steel cofferdam straight-line sections (A areas), steel cofferdam transition sections (B areas), steel cofferdam circular arc sections (C areas) and site in-situ assembling. The steel cofferdam is layered and partitioned into standard sections, the standard sections are welded on a supporting jig frame after blanking is carried out at a bridge position, and then the standard sections are hoisted and connected to form at the original position of a bridge tower by utilizing a crawler crane. The method has the advantages of simple combination, high installation efficiency, safe construction and accurate positioning.
Description
Technical Field
The invention relates to a construction method of a steel cofferdam, in particular to a construction method of a large double-wall steel cofferdam for Yangtze river shoals.
Background
The construction quality of the steel cofferdam of the suspension bridge is an important guarantee for ensuring the smooth construction of the cushion cap of the suspension bridge, and meanwhile, the construction safety before the water flows out of the main tower of the suspension bridge is also ensured. At present, large double-wall steel cofferdams in the industry are mainly processed in factories, and a construction method for integrally hoisting the steel cofferdams in place in a layered manner by using large-tonnage floating cranes after the steel cofferdams are transported to bridge positions in a floating manner is adopted. On one hand, the method needs a large-tonnage floating crane of more than 600t, and has long construction period and is uneconomical; on the other hand, the hoisting construction has higher requirements on the water level of the Yangtze river, the positioning difficulty of the first section is high, and the welding quality of the high-joint is difficult to ensure. Therefore, a construction method which is simple in construction and high in installation efficiency, can accurately position the steel cofferdam on the shoals of the Yangtze river and can ensure the construction quality of the steel cofferdam is urgently needed.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a construction method which is simple in construction and high in installation efficiency, can accurately position a steel cofferdam on a shoal of the Yangtze river and simultaneously ensures the construction quality of the steel cofferdam.
In order to achieve the purpose, the invention is realized by the following technical scheme:
the invention relates to a construction method of a large double-wall steel cofferdam for Yangtze river shoals, which comprises the following steps:
step one, in the dry season of Yangtze river, a temporary processing field and a finished product stacking area of a steel cofferdam structure are respectively selected beside a bridge tower, then material transportation sidewalks are built around the temporary processing field and the finished product stacking area, the material transportation sidewalks are communicated with a steel cofferdam assembling and welding construction field beside the bridge tower, meanwhile, a flood control earth-rock cofferdam is firstly filled in the outer ring of the set position of the steel cofferdam, and the top elevation of the flood control earth-rock cofferdam is not lower than the bottom sealing concrete elevation;
step two, steel cofferdam processing is carried out on the temporary processing field of the steel cofferdam structure, the steel cofferdam is composed of two arc sections which are symmetrically arranged at the left and the right, the opening ends of the two arc sections are respectively connected through a straight line section, a transition section is respectively arranged at the joint of each straight line section and the two arc sections, the shape of the transition section is obtained after the transition section reaches the optimal stress state through finite element software calculation, and the processing process is as follows:
step one, setting the machining size of the steel cofferdam: dividing the steel cofferdam into five layers of steel cofferdam units in height, and respectively processing the steel cofferdam units, wherein each layer of steel cofferdam unit is divided into three sections according to a straight line section, a transition section and an arc section for processing, the central angle of the arc section is 180-360 degrees, each straight line section is divided into two straight line sections for processing, each arc section is divided into a plurality of fan-shaped sections for processing, and the central angle of each fan-shaped section is 30-60 degrees;
secondly, manufacturing jig frame templates of the straight line sections, the transition sections and the circular arc sections at a temporary processing site according to preset sizes of the straight line sections, the transition sections and the circular arc sections, wherein the shape of the top surface of each jig frame template is consistent with that of the outer layer of the steel cofferdam to be processed, then finishing the processing of the outer layer of each section of each layer on the correspondingly arranged jig frame template, welding ribbed plates on the outer layer, and finally welding the inner layer of each section on the ribbed plates;
step three, reversely excavating in the flood control earth-rock cofferdam to the elevation of the back cover concrete and leveling;
transporting the straight line section, the transition section and the arc section to a steel cofferdam assembly welding construction site through a material transportation sidewalk in sequence, hoisting and hoisting each section forming the first layer of steel cofferdam unit to a set position of the steel cofferdam by using a crane, welding each section of the first layer of steel cofferdam unit, and finally pouring bottom sealing concrete in the steel cofferdam;
hoisting each section of the second layer of steel cofferdam unit and then installing the sections on the top wall of the corresponding position of each section of the first layer of steel cofferdam unit according to the method of the fourth step, welding the bottom surface of each section of the second layer of steel cofferdam unit and each section of the first layer of steel cofferdam unit, and then welding each section of the second layer of steel cofferdam unit;
step six, repeating the step four and the step five, and sequentially completing the hoisting and welding of the third layer steel cofferdam unit to the fifth layer steel cofferdam unit;
and seventhly, carrying out bearing platform construction in the steel cofferdam.
Compared with the prior art, the invention has the following beneficial effects:
the method utilizes seasonal low-water-level neutral gear of the Yangtze river shoal to process the scattered assembled sections at the bridge position, then sequentially assembles and hoists the sections, and the sections are layered and integrated, so that the structural construction is simple and efficient, the problem that the large double-wall steel cofferdam of the Yangtze river shoal is difficult to install is effectively solved, the equipment lease cost is reduced, and the construction period is shortened.
Drawings
FIG. 1 is a plan view of a bridge site according to the present invention;
FIG. 2 is a schematic view of the steel cofferdam structure of the present invention;
FIG. 3 isbase:Sub>A schematic sectional view A-A of the steel cofferdam structure of the present invention;
FIG. 4 is a schematic sectional view of the steel cofferdam structure B-B of the present invention.
Detailed Description
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in the attached drawings, the construction method of the large double-wall steel cofferdam for the Yangtze river shoal comprises the following steps:
firstly, as shown in figure 1, in the dry season of Yangtze river, a temporary processing field 3 and a finished product stacking area 4 of a steel cofferdam structure are respectively selected beside a bridge tower, then a material transportation sidewalk 5 is built around the temporary processing field 3 and the finished product stacking area 4, the material transportation sidewalk 5 is communicated with a splicing welding construction field of the steel cofferdam 1 beside the bridge tower, each steel cofferdam plate processed and finished in the temporary processing field 3 is stored in the finished product stacking area 4, when the material transportation sidewalk is required to be used, the steel cofferdam 1 is transported to be spliced and welded through the material transportation sidewalk 5, meanwhile, a flood control earth-rock cofferdam 6 is filled in the outer ring of the set steel cofferdam 1, the height and the size of the flood control earth-rock cofferdam 6 are determined according to the hydrogeological conditions at the bridge construction position, wherein the top mark height of the flood control earth-rock cofferdam 6 is not lower than the sealing concrete bottom elevation 8, and the size is not smaller than the steel cofferdam 6;
step two, steel cofferdam processing is carried out on the temporary processing field 3 of the steel cofferdam structure, the steel cofferdam is two arc sections which are symmetrically arranged at the left and the right, the open ends of the two arc sections are respectively connected through a straight line section, a transition section is respectively arranged at the joint of each straight line section and the two arc sections, the shape of the transition section is obtained after the transition section reaches the optimal stress state through finite element software calculation, and the processing process is as follows:
step one, setting the machining size of the steel cofferdam: dividing the steel cofferdam 1 into five layers of steel cofferdam units a, B, C, d and e in height, respectively processing, wherein each layer of steel cofferdam unit is divided into three sections according to a straight line section, a transition section B1 (B2) and an arc section for processing, the central angle of the arc section is 180-360 degrees, each straight line section is divided into two straight line sections A1 (A2) for processing, each arc section C1 (C2) is equally divided into a plurality of (such as 4 or six) sector-shaped sections for processing, and the central angle of each sector-shaped section is 30-60 degrees;
secondly, manufacturing jig frame templates of the straight line sections, the transition sections and the circular arc sections at the temporary processing site 3 according to preset sizes of the straight line sections, the transition sections and the circular arc sections, wherein the shape of the top surface of each jig frame template is consistent with that of the outer layer of the steel cofferdam to be processed, then finishing the processing of the outer layer of each section of each layer on the correspondingly arranged jig frame template, welding ribbed plates on the outer layer, and finally welding the inner layer of each section on the ribbed plates;
thirdly, reversely excavating the earth-rock cofferdam at the bridge position to the height of 8-level of the bottom sealing concrete and leveling;
and step four, transporting the straight line sections, the transition sections and the circular arc sections to a bridge site through a transportation sidewalk 5 in sequence, hoisting and hanging all sections forming the first layer of steel cofferdam unit to a set position of the steel cofferdam by using a crane, welding all sections of the first layer of steel cofferdam unit, and finally pouring bottom sealing concrete 8 (the thickness can be 3 m) in the steel cofferdam.
Hoisting each section of the second layer of steel cofferdam unit and then installing the sections on the top wall of the corresponding position of each section of the first layer of steel cofferdam unit according to the method of the fourth step, welding the bottom surface of each section of the second layer of steel cofferdam unit and each section of the first layer of steel cofferdam unit, and then welding each section of the second layer of steel cofferdam unit;
step six, step five, finish the third layer of steel cofferdam units to the hoisting, welding of the fifth layer of steel cofferdam units sequentially;
and seventhly, constructing a bearing platform 7 in the steel cofferdam.
The double-wall steel cofferdam constructed by the method is used as a bearing platform construction water retaining structure, and the borne load comprises water flow impact force and water head pressure.
In conclusion, the construction cost of the steel cofferdam 1 is reduced, the installation quality is ensured, and the construction period is shortened.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (1)
1. A construction method of a large double-wall steel cofferdam for a Yangtze river shoal is characterized by comprising the following steps:
firstly, in the dry season of Yangtze river, respectively selecting a temporary processing field and a finished product stacking area of a steel cofferdam structure beside a bridge tower, then building a material transportation sidewalk around the temporary processing field and the finished product stacking area, wherein the material transportation sidewalk is communicated with a steel cofferdam splicing and welding construction field beside the bridge tower, and meanwhile, a flood control earth-rock cofferdam is filled in the outer ring of the set position of the steel cofferdam, wherein the top elevation of the flood control earth-rock cofferdam is not lower than the bottom sealing concrete elevation;
step two, processing the steel cofferdam in the temporary processing field of the steel cofferdam structure, wherein the steel cofferdam is formed by a left arc section and a right arc section which are symmetrically arranged, the open ends of the two arc sections are connected through a straight line section respectively, a transition section is arranged at the joint of each straight line section and the two arc sections respectively, the shape of the transition section is calculated through finite element software and is obtained after the transition section reaches the optimal stress state, and the processing process is as follows:
step one, setting the machining size of a steel cofferdam: dividing the steel cofferdam into five layers of steel cofferdam units in height, and respectively processing the steel cofferdam units, wherein each layer of steel cofferdam unit is divided into three sections according to a straight line section, a transition section and an arc section for processing, the central angle of the arc section is 180-360 degrees, each straight line section is divided into two straight line sections for processing, each arc section is divided into a plurality of fan-shaped sections for processing, and the central angle of each fan-shaped section is 30-60 degrees;
secondly, manufacturing jig frame templates of the straight line sections, the transition sections and the circular arc sections at a temporary processing place according to preset sizes of the straight line sections, the transition sections and the circular arc sections, wherein the shape of the top surface of each jig frame template is consistent with that of the outer layer of the steel cofferdam to be processed, then finishing the processing of the outer layer of each section of each layer on the correspondingly arranged jig frame templates, welding ribbed plates on the outer layer, and finally welding the inner layer of each section on the ribbed plates;
step three, reversely excavating in the flood control earth-rock cofferdam to the elevation of the back cover concrete and leveling;
transporting the straight line section, the transition section and the arc section to a steel cofferdam assembly welding construction site through a material transportation sidewalk in sequence, hoisting and hoisting each section forming the first layer of steel cofferdam unit to a set position of the steel cofferdam by using a crane, welding each section of the first layer of steel cofferdam unit, and finally pouring bottom sealing concrete in the steel cofferdam;
fifthly, hoisting each section of the second layer of steel cofferdam unit according to the method of the fourth step, then installing each section on the top wall of the corresponding position of each section of the first layer of steel cofferdam unit, welding the bottom surface of each section of the second layer of steel cofferdam unit with each section of the first layer of steel cofferdam unit, and then welding each section of the second layer of steel cofferdam unit;
step six, repeating the step four and the step five, and sequentially completing the hoisting and welding of the third layer steel cofferdam unit to the fifth layer steel cofferdam unit;
and seventhly, carrying out bearing platform construction in the steel cofferdam.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110814476.9A CN113482023B (en) | 2021-07-19 | 2021-07-19 | Construction method of large double-wall steel cofferdam for Yangtze river shoal |
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| CN202110814476.9A CN113482023B (en) | 2021-07-19 | 2021-07-19 | Construction method of large double-wall steel cofferdam for Yangtze river shoal |
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| CN113482023A CN113482023A (en) | 2021-10-08 |
| CN113482023B true CN113482023B (en) | 2023-02-17 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144677A (en) * | 1998-11-05 | 2000-05-26 | Taisei Corp | Temporary cofferdam construction method |
| CN107237338A (en) * | 2017-05-23 | 2017-10-10 | 中铁建大桥工程局集团第工程有限公司 | Double-Wall Steel Boxed Cofferdam piecemeal transfers construction method |
| CN108589543A (en) * | 2018-05-14 | 2018-09-28 | 中铁七局集团有限公司勘测设计研究院 | The construction method for building island steel sheet-pile cofferdam formula drilled pile platform suitable for formation geology |
| CN108867672A (en) * | 2018-08-24 | 2018-11-23 | 中国建筑第四工程局有限公司 | A kind of Double-Wall Steel Boxed Cofferdam joining method |
| CN111042164A (en) * | 2019-12-31 | 2020-04-21 | 湖北省路桥集团有限公司 | Composite special-shaped cofferdam and construction method |
-
2021
- 2021-07-19 CN CN202110814476.9A patent/CN113482023B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000144677A (en) * | 1998-11-05 | 2000-05-26 | Taisei Corp | Temporary cofferdam construction method |
| CN107237338A (en) * | 2017-05-23 | 2017-10-10 | 中铁建大桥工程局集团第工程有限公司 | Double-Wall Steel Boxed Cofferdam piecemeal transfers construction method |
| CN108589543A (en) * | 2018-05-14 | 2018-09-28 | 中铁七局集团有限公司勘测设计研究院 | The construction method for building island steel sheet-pile cofferdam formula drilled pile platform suitable for formation geology |
| CN108867672A (en) * | 2018-08-24 | 2018-11-23 | 中国建筑第四工程局有限公司 | A kind of Double-Wall Steel Boxed Cofferdam joining method |
| CN111042164A (en) * | 2019-12-31 | 2020-04-21 | 湖北省路桥集团有限公司 | Composite special-shaped cofferdam and construction method |
Non-Patent Citations (1)
| Title |
|---|
| 襄樊汉江五桥双壁钢围堰分层分块施工技术;赵兴寨等;《铁道建筑》;20111215(第12期);第31-33页 * |
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