CN114645549A - Construction method of steel sheet pile cofferdam - Google Patents
Construction method of steel sheet pile cofferdam Download PDFInfo
- Publication number
- CN114645549A CN114645549A CN202011523390.2A CN202011523390A CN114645549A CN 114645549 A CN114645549 A CN 114645549A CN 202011523390 A CN202011523390 A CN 202011523390A CN 114645549 A CN114645549 A CN 114645549A
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- CN
- China
- Prior art keywords
- foundation pit
- steel sheet
- sheet pile
- construction method
- pile cofferdam
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 34
- 239000010959 steel Substances 0.000 title claims abstract description 34
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000009412 basement excavation Methods 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000009415 formwork Methods 0.000 claims abstract description 4
- 230000000149 penetrating effect Effects 0.000 claims abstract description 3
- 239000004575 stone Substances 0.000 claims description 7
- 230000006837 decompression Effects 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 3
- 238000009827 uniform distribution Methods 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005266 casting Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
Images
Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/02—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against ground humidity or ground water
Abstract
The invention discloses a construction method of a steel sheet pile cofferdam, which comprises the following steps: step 1: arranging a permeable cushion layer at the bottom of the foundation pit after excavation is finished; step 2: additionally arranging pressure reducing pipes at multiple positions at the bottom of the foundation pit; and step 3: a bottom sealing concrete layer is arranged on the upper side of the permeable cushion layer; and 4, step 4: arranging a bearing platform sealing layer on the upper side of the bottom sealing concrete layer; and 5: arranging pressure reducing pipes at a plurality of positions of the foundation pit, and inserting the pressure reducing pipes into the water-permeable cushion layer arranged in the step 1 after penetrating through the bearing platform sealing layer; step 6: and after the bottom-sealed concrete layer is finally set, additionally arranging a frame ring beam along the periphery of the steel sheet pile of the foundation pit by adopting an underwater vertical formwork method. The construction method of the steel sheet pile cofferdam reduces the disturbance of the foundation pit base caused by the over-deep excavation, ensures the construction safety, improves the rigidity and the safety of the steel sheet pile cofferdam supporting system, and improves the work efficiency of the foundation pit construction.
Description
Technical Field
The invention relates to a construction method of a steel sheet pile cofferdam.
Background
When the conventional steel sheet pile cofferdam foundation is excavated, the excavated earthwork quantity of the foundation is large, the thickness of bottom sealing concrete is large, the excavation construction difficulty is large, the construction safety risk is high, and the resource consumption is large.
Disclosure of Invention
The invention provides a construction method of a steel sheet pile cofferdam, which adopts the following technical scheme:
a construction method of a steel sheet pile cofferdam comprises the following steps:
step 1: arranging a permeable cushion layer at the bottom of the foundation pit after excavation is finished;
step 2: additionally arranging pressure reducing pipes at multiple positions at the bottom of the foundation pit;
and step 3: a bottom sealing concrete layer is arranged on the upper side of the permeable cushion layer;
and 4, step 4: arranging a bearing platform sealing layer on the upper side of the bottom sealing concrete layer;
and 5: arranging pressure reducing pipes at a plurality of positions of the foundation pit, and inserting the pressure reducing pipes into the water-permeable cushion layer arranged in the step 1 after penetrating through the bearing platform sealing layer;
step 6: and after the bottom-sealed concrete layer is finally set, additionally arranging a frame ring beam along the periphery of the steel sheet pile of the foundation pit by adopting an underwater vertical formwork method.
Further, the permeable cushion layer in the step 1 is formed by bagging crushed stones with the particle size of 0.01m-0.02m and stacking the crushed stones at the bottom of the foundation pit with the thickness of 0.5 m.
Further, the foundation pit is a square foundation pit; adding the pressure reducing pipes in the step 2 at four corners of the bottom of the square foundation pit;
furthermore, second pressure reducing pipes are respectively arranged at four corners of the square foundation pit, and the diameter of each second pressure reducing pipe is 0.3 m; the four second pressure reducing pipes form a communicating vessel.
And further, in the step 3, a conduit diffusion degree uniform distribution conduit method is adopted to pour the bottom sealing concrete layer.
Further, the thickness of the bottom sealing concrete layer is more than or equal to 0.775m and less than or equal to 0.825 m.
Further, the frame ring beam is poured by adopting an underwater conduit method.
Further, the frame coil beam was 1.2m high and 0.8m thick.
The construction method of the steel sheet pile cofferdam has the advantages that after the steel sheet pile cofferdam supporting system is systematically optimized, the excavation amount of the earth volume of the foundation pit and the pouring amount of the seal concrete are reduced, the disturbance of the foundation pit base caused by the over-deep excavation is reduced, the construction safety is ensured, the rigidity and the safety of the steel sheet pile cofferdam supporting system are improved, and the work efficiency of foundation pit construction is improved.
Drawings
FIG. 1 is a schematic flow chart of the construction method of the steel sheet pile cofferdam of the present invention;
FIG. 2 is a schematic structural view of a steel sheet pile cofferdam constructed according to the construction method of the steel sheet pile cofferdam of the present invention;
FIG. 3 is another schematic view of the structure of the steel sheet pile cofferdam constructed according to the construction method of the steel sheet pile cofferdam of the present invention;
the foundation ditch 11, the bed course 12 that permeates water, the decompression pipe 13, the concrete layer 14 of back cover, cushion cap seal 15, second decompression pipe 16, frame collar tie 17.
Detailed Description
The invention is described in detail below with reference to the figures and the embodiments.
As shown in fig. 1 to 3, the construction method of a steel sheet pile cofferdam of the present invention includes the following steps:
step 1: and arranging a permeable cushion layer 12 at the bottom of the foundation pit 11 which is excavated.
Specifically, the permeable cushion layer 12 in the step 1 is formed by bagging crushed stones with the particle size of 0.01m-0.02m and stacking the crushed stones at the bottom of the foundation pit 11 to form the permeable cushion layer with the thickness of 0.5 m. The weight of each bag of crushed stone is between 15KG and 20 KG. The foundation pit 11 base after the excavation can be leveled by arranging the permeable cushion layer 12, the thickness of the bottom sealing concrete layer 14 is effectively ensured, the base of the foundation pit 11 is made to be permeable, and the buoyancy of the base is uniformly dispersed so as to increase the weight of the base, thereby improving the uplift resistance of the base.
Step 2: decompression pipes 13 are additionally arranged at a plurality of positions at the bottom of the foundation pit 11 to disperse buoyancy below the bottom-sealed concrete layer 14.
As a specific embodiment, the foundation pit 11 is a square foundation pit 11. And (3) additionally arranging the pressure reducing pipes 13 in the step (2) at four corners at the bottom of the square foundation pit (11), so that the uniform buoyancy below the bottom-sealed concrete layer (14) is ensured, and the stability of the substrate structure is ensured.
And 3, step 3: a back cover concrete layer 14 is provided on the upper side of the water-permeable mat layer 12.
Specifically, in the step 3, the bottom-sealing concrete layer 14 is poured by adopting a conduit-diffusivity uniform-distribution conduit method, so that disturbance caused by over-deep excavation of the foundation pit 11 base can be effectively reduced, and the concrete consumption is reduced. The thickness of the back cover concrete layer 14 is more than or equal to 0.775m and less than or equal to 0.825m, so that the engineering quantity of the underwater back cover concrete layer 14 is effectively reduced.
And 4, step 4: a cap layer 15 is provided on the upper side of the lower concrete layer 14.
And 5: and arranging pressure reducing pipes 16 at a plurality of positions of the foundation pit 11, and inserting the pressure reducing pipes 16 into the water permeable cushion layer 12 arranged in the step 1 through the bearing platform sealing layer 15.
As a specific embodiment, the second decompression pipes 16 are respectively arranged at four corners of the square foundation pit 11, and the diameter of each second decompression pipe 16 is 0.3 m. The four second pressure reducing pipes 16 form a communicating vessel, thereby further ensuring that the buoyancy under the back cover concrete layer 14 is uniform and ensuring the stability of the base structure
Step 6: after the bottom-sealed concrete layer 14 is finally set, a frame girth 17 is additionally arranged along the periphery of the steel sheet pile of the foundation pit 11 by adopting an underwater vertical formwork method.
Specifically, the frame collar beams 17 are cast by an underwater conduit method, so that concrete is not dispersed in the casting process. The frame ring beam 17 is 1.2m high and 0.8m thick, and has stable structure.
Particularly, by the construction mode, the supporting system of the steel sheet pile cofferdam is systematically optimized, so that disturbance caused by over-deep excavation of the soft foundation pit 11 base of the riverbed can be effectively reduced, the engineering quantity of the underwater bottom sealing concrete layer 14 is reduced due to the addition of the frame ring beam 17, the overall rigidity of the steel sheet pile cofferdam is obviously enhanced, and various safety risks caused by deformation of the steel sheet piles in the excavation and bottom sealing construction processes of the foundation pit 11 are greatly reduced; the construction process effectively shortens the excavation and sealing construction time of the steel sheet pile cofferdam foundation pit 11, greatly improves the construction efficiency of the underwater pier, successfully implements and applies the construction process innovation, reduces the foundation pit 11 sludge excavation and underwater bottom sealing concrete engineering quantity with the thickness of 1.7m, saves the cost by accounting for about 25.5 ten thousand yuan for each main pier bearing platform of the deep water foundation pit 11, saves the total cost by about 102 ten thousand yuan for 4 deep water foundation pits 11 bearing platforms in total, and obtains better economic benefit.
The foregoing shows and describes the general principles, principal features and advantages of the invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by using equivalents or equivalent changes fall within the protection scope of the present invention.
Claims (8)
1. The construction method of the steel sheet pile cofferdam is characterized by comprising the following steps:
step 1: arranging a permeable cushion layer at the bottom of the foundation pit after excavation is finished;
step 2: additionally arranging pressure reducing pipes at a plurality of positions at the bottom of the foundation pit;
and step 3: a bottom sealing concrete layer is arranged on the upper side of the permeable cushion layer;
and 4, step 4: arranging a bearing platform sealing layer on the upper side of the bottom sealing concrete layer;
and 5: arranging pressure reducing pipes at a plurality of positions of the foundation pit, and inserting the pressure reducing pipes into the water-permeable cushion layer arranged in the step 1 after penetrating through the bearing platform sealing layer;
step 6: and after the bottom-sealed concrete layer is finally set, additionally arranging a frame ring beam along the periphery of the steel sheet pile of the foundation pit by adopting an underwater vertical formwork method.
2. The construction method of the steel sheet pile cofferdam of claim 1,
the permeable cushion layer in the step 1 is formed by bagging broken stones with the particle size of 0.01m-0.02m and stacking the broken stones with the thickness of 0.5m at the bottom of the foundation pit.
3. The construction method of a steel sheet pile cofferdam according to claim 1,
the foundation pit is a square foundation pit; and (3) additionally arranging the decompression pipes in the step (2) at four corners of the bottom of the square foundation pit.
4. The construction method of a steel sheet pile cofferdam according to claim 3,
respectively arranging second pressure reducing pipes at four corners of the square foundation pit, wherein the diameters of the second pressure reducing pipes are 0.3 m; and four second pressure reducing pipes form a communicating vessel.
5. The construction method of a steel sheet pile cofferdam according to claim 1,
and 3, pouring the bottom sealing concrete layer by adopting a conduit diffusivity uniform distribution conduit method.
6. The construction method of the steel sheet pile cofferdam of claim 5,
the thickness of the back cover concrete layer is more than or equal to 0.775m and less than or equal to 0.825 m.
7. The construction method of a steel sheet pile cofferdam according to claim 5,
the frame ring beam is poured by adopting an underwater conduit method.
8. The construction method of a steel sheet pile cofferdam according to claim 7,
the frame ring beam is 1.2m high and 0.8m thick.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011523390.2A CN114645549A (en) | 2020-12-21 | 2020-12-21 | Construction method of steel sheet pile cofferdam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011523390.2A CN114645549A (en) | 2020-12-21 | 2020-12-21 | Construction method of steel sheet pile cofferdam |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114645549A true CN114645549A (en) | 2022-06-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202011523390.2A Pending CN114645549A (en) | 2020-12-21 | 2020-12-21 | Construction method of steel sheet pile cofferdam |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094425A (en) * | 2010-12-24 | 2011-06-15 | 中铁六局集团有限公司 | Foundation pit construction method adopting shallow buried depth Larsen steel plate pile as protective cofferdam |
| CN103882878A (en) * | 2014-03-21 | 2014-06-25 | 北京工业大学 | Method for constructing combined type steel sheet pile cofferdam for abrupt slope hard rock river bed deepwater bearing platform |
| CN104196034A (en) * | 2014-09-18 | 2014-12-10 | 中建交通建设集团有限公司 | Foundation pit construction method employing steel sheet piles as support cofferdam |
| CN104294835A (en) * | 2014-10-14 | 2015-01-21 | 中国水利水电第四工程局有限公司 | Steel sheet pile cofferdam constructing method |
| CN105507335A (en) * | 2016-01-07 | 2016-04-20 | 中铁十四局集团第三工程有限公司 | Steel sheet pile cofferdam pit bottom sealing structure and construction method |
| CN106812146A (en) * | 2017-03-13 | 2017-06-09 | 中铁二十三局集团第工程有限公司 | A kind of construction method of steel sheet-pile cofferdam concrete sealing bottom |
-
2020
- 2020-12-21 CN CN202011523390.2A patent/CN114645549A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102094425A (en) * | 2010-12-24 | 2011-06-15 | 中铁六局集团有限公司 | Foundation pit construction method adopting shallow buried depth Larsen steel plate pile as protective cofferdam |
| CN103882878A (en) * | 2014-03-21 | 2014-06-25 | 北京工业大学 | Method for constructing combined type steel sheet pile cofferdam for abrupt slope hard rock river bed deepwater bearing platform |
| CN104196034A (en) * | 2014-09-18 | 2014-12-10 | 中建交通建设集团有限公司 | Foundation pit construction method employing steel sheet piles as support cofferdam |
| CN104294835A (en) * | 2014-10-14 | 2015-01-21 | 中国水利水电第四工程局有限公司 | Steel sheet pile cofferdam constructing method |
| CN105507335A (en) * | 2016-01-07 | 2016-04-20 | 中铁十四局集团第三工程有限公司 | Steel sheet pile cofferdam pit bottom sealing structure and construction method |
| CN106812146A (en) * | 2017-03-13 | 2017-06-09 | 中铁二十三局集团第工程有限公司 | A kind of construction method of steel sheet-pile cofferdam concrete sealing bottom |
Non-Patent Citations (1)
| Title |
|---|
| 刘自明等: "《土木工程施工工艺桥梁工程》", 人民交通出版社, pages: 309 * |
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Application publication date: 20220621 |
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