CN105714837A - Diversion construction method for up-pull-method open sea no-cover steel cofferdam closure gap - Google Patents
Diversion construction method for up-pull-method open sea no-cover steel cofferdam closure gap Download PDFInfo
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- CN105714837A CN105714837A CN201610075497.2A CN201610075497A CN105714837A CN 105714837 A CN105714837 A CN 105714837A CN 201610075497 A CN201610075497 A CN 201610075497A CN 105714837 A CN105714837 A CN 105714837A
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- steel sheet
- sheet pile
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- steel cofferdam
- longkou
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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
- E02D2250/00—Production methods
- E02D2250/0061—Production methods for working underwater
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- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- General Engineering & Computer Science (AREA)
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Abstract
The invention discloses a diversion construction method for an up-pull-method open sea no-cover steel cofferdam closure gap. The method comprises the following steps: A. upwards pulling part of steel sheet piles at intervals at one side of a steel cofferdam closure gap in a low tide period to form a diversion water passing channel; B. inserting the steel sheet piles at the closure gap until completing closure of the closure gap; C, inserting the upwards pulled steel sheet pile to a design elevation to reset; D, inserting cabin separating piles between the reset steel sheet piles, ripraping in the formed separation cabins, and cutting off the diversion water passing channel, thus completing the closure construction of the steel cofferdam closure gap. According to the diversion construction method for an up-pull-method open sea no-cover steel cofferdam closure gap, diversion closure construction of the steel cofferdam closure gap is realized under the condition of no cover in open sea, and the method is simple and quick in construction, high in efficiency and short in duration. Under the condition of ensuring safety and schedule, the inside and outside water level difference of the steel cofferdam can be kept to be within +/-100cm, thus greatly reducing impact force borne by the steel cofferdam due to inside and outside water level difference and improving the reliability and the stability of the steel cofferdam.
Description
Technical field
The present invention relates to steel cofferdam construction technology, specifically, be one is pulled out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method.
Background technology
Cushion cap in deep water foundation is generally adopted " cofferdam method " construction, utilizes cofferdam to create the working space of a dry construction bearing platform, and steel cofferdam is a kind of conventional cofferdam.When carrying out cofferdam construction, it is necessary to Longkou is closed up by the final stage in construction.And when at sea constructing, by the impact of monsoon, typhoon, the impact in greasy weather and flood tide, tidal range is big.Big flood tide is surged relatively big period, and duration of tide is very fast, and when steel sheet pile Longkou closes up, because being affected by tidewater, the low tide time is shorter, Longkou closure time meeting wretched insufficiency, causes extreme difficulties to the closure construction of steel cofferdam Longkou.
Especially, when carrying out offshore construction, owing to cofferdam inner area is big, steel cofferdam can be caused great pressure in water-head produced by the sea water fluctuation time of tide, further, the current that water-head causes are intended to flow in or out from Long Kouchu, and this can close up to Longkou and brings great difficulty.It addition, offshore construction also has the problem that (1) is owing to off-lying sea is without shielding isolated island operation, execution conditions are arduous, and difficulty of construction is big；(2) stormy waves is more, and the engineering time is limited, need to complete again before typhoon arrives, and the duration is tight；(3) make moist position influence, and inside and outside steel cofferdam, water-head is at ± about 3.0m, and closures current is rapid, and it is big that Longkou closes up difficulty；(4) along with the Guan Bi gradually of diversion section, outlet reduces, and flow rate of water flow can increase；The turbulent river crashes its way through, scouring sediment, affects platform stable, critical workmen's safety.
Summary of the invention
The technical problem to be solved in the present invention is to provide in one and pulls out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method, it is adaptable to carry out Longkou water conservancy diversion construction under the unprotected condition in off-lying sea, and construction is simple rapidly, efficiency is high.
In order to solve above-mentioned technical problem, the invention provides and one is pulled out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method, including:
A, the low tide period pull out on interval, side, steel cofferdam Longkou a part of steel sheet pile formed water conservancy diversion cross aquaporin；
B, at Longkou place inserted to play steel sheet pile, until completing the closure of Longkou；
C, by the steel sheet pile inserted to play pulled out to design altitude to reset；
D, reset steel sheet pile between inserted to play compartment stake, and formed compartment in jackstone, water conservancy diversion is crossed aquaporin and blocks, complete steel cofferdam Longkou closure construction.
Further, in described step A, before above pulling out described steel sheet pile, first will on the steel sheet pile that pulls out block from bottom, after described steel sheet pile pulls out, form bar gate type water conservancy diversion and cross aquaporin.
Further, described water conservancy diversion is crossed the width of aquaporin and is not less than 8 meters.
Further, in described step A, the height that steel sheet pile pulls out is 2.5-3.5 rice.
Further, in described step A, the height that steel sheet pile pulls out is 3 meters.
Further, in described step A, when a part of steel sheet pile is pulled out at interval, on a steel sheet pile, pull out a steel sheet pile.
Further, in described step A, before upper group of described steel sheet pile, first steady brace is set in the middle part of described steel sheet pile.
Further, in described step B, arranging steel sheet pile in Longkou section inserted to play two and install pull bar, in the compartment formed between backward two the row's steel sheet piles of pull bar installation, jackstone and hydraulic reclamation are husky, complete the closure of Longkou.
Further, after described step A, the upper steel sheet pile pulled out offers bonnet lock hole with corresponding section, steel sheet pile top, both sides, by snap close by adjacent steel sheet pile docking.
Further, after described step C, sealing member is set at described bonnet lock hole place described bonnet lock hole is sealed.
The present invention pulls out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method, it is achieved that water conservancy diversion closure construction to steel cofferdam Longkou under the unprotected condition in off-lying sea, and construct simple rapidly, efficiency is high, the duration is short.The method of the present invention is when ensureing safety, progress, it is possible to makes inside and outside steel cofferdam water-head within ± 100cm, substantially reduces the impulsive force that steel cofferdam bears because of inside and outside water-head, improve the reliability and stability of steel cofferdam.
Accompanying drawing explanation
Fig. 1 is the implementing procedure figure of the Longkou closure construction method of the present invention.
Fig. 2 be the present invention on pull out the construction schematic diagram of method Longkou closure construction method.
Fig. 3 is the schematic diagram of weld seam leak stopping structure in the present invention.
Fig. 4 is the construction schematic diagram of gate method Longkou closure construction method in the present invention.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the invention will be further described, so that those skilled in the art can be more fully understood that the present invention and can be practiced, but illustrated embodiment is not as a limitation of the invention.
As it is shown in figure 1, referring also to shown in Fig. 2, the steel cofferdam Longkou closure construction method of the present invention, including:
Step 101: pull out a part of steel sheet pile 1 on interval, side, steel cofferdam Longkou in the low tide period and form water conservancy diversion and cross aquaporin 2；
Step 102: at Longkou place inserted to play steel sheet pile, until completing the closure of Longkou；
Step 103: by steel sheet pile 1 inserted to play pulled out to design altitude to reset；
Step 104: reset steel sheet pile 1 between inserted to play compartment stake, and formed compartment in jackstone, water conservancy diversion is crossed aquaporin and blocks, complete steel cofferdam Longkou closure construction.
Preferably, in the present embodiment, when a part of steel sheet pile is pulled out at interval, it is possible to pull out a steel sheet pile on a steel sheet pile.Certainly, one can also be pulled out on two or more steel sheet piles as required.Described water conservancy diversion is crossed the width of aquaporin and is typically no less than 8 meters, and the height that steel sheet pile pulls out is 2.5-3.5 rice.It is further preferable that the height pulled out on steel sheet pile is 3 meters.
In described step 101, before upper group of described steel sheet pile 1, it is possible to first steady brace 3 is set in the middle part of described steel sheet pile.Further, in described step 101, outside diversion section steel sheet pile, blotter throwing is to-1.0m, and in storehouse, hydraulic fill sand is to 0.0m, and inner side hydraulic fill sand is more than-1.0m.Inside and outside steel cofferdam, water-head controls within ± 1.0m, and diversion section gate water velocity controls in 2.4m/s, and steel cofferdam safety coefficient is high.
In one embodiment, because diversion section steel sheet pile blocks from ± 0.0 absolute altitude, it is then lifted out to+3.0 absolute altitudes; therefore in diversion section storehouse, hydraulic reclamation is husky to-0.5 absolute altitude, then carries out 160kn/ geotextile laying, carries out sand bed protection; then adopt sandbag suppression, reduce hydraulic reclamation sand drift and lose.It addition, need for construction, it is simple to hydraulic reclamation sand and jackstone in diversion section later stage storehouse, it is possible to first throwing rubble outside storehouse；
After described step 101, it is also possible to offer bonnet lock hole with corresponding section, steel sheet pile top, both sides on the upper steel sheet pile pulled out, by snap close by adjacent steel sheet pile snap close docking.Correspondingly, after step 103, sealing member is set at described bonnet lock hole place described bonnet lock hole is sealed.
Specifically, in one embodiment, set diversion section and do not needed to install on the inner side steel sheet pile of pull bar 3 and pulled out 5.5m, 6.3m has been pulled out in outside plate stake, then inner side steel sheet pile carries out completely cut off in+5.5 elevations, outside plate stake at+6.3 elevations, and then inserted to play is to designed elevation.Alternatively, it is also possible to inner side steel sheet pile is carried out snap close cutting in+5.5 elevations, outside plate stake at+6.3 elevations, form bonnet lock hole, recover to designed elevation, when low tide, carry out steel sheet pile snap close place and block.When entirely cutting rear steel sheet pile inserted to play, top cutting of steel sheet pile snap close needs again the docking of both sides snap close, and difficulty of construction increases, and therefore adopting snap close patterning method to carry out construction is preferably select.
It addition, after diversion section steel sheet pile closes up, release welding with oxygen welding, by pull out steel sheet pile and recover to ± 0.0 absolute altitude, carry out welding and recover.When welding recovers, weld seam leak stopping process is the emphasis of steel cofferdam, and steel sheet pile cutting is welded to designed elevation in recovery, but water leakage situation is comparatively serious, and for reducing water percolating capacity, after steel sheet pile has welded, employing steel sheet pile weld seam both sides reinforce encapsulation process.Processing structure as it is shown on figure 3, adopt rubber sheet gasket 5 to seal inside and outside weld seam 7, then adopt steel plate 4 to fix, steel plate adopts nut 6 both sides to fix, and solves weld seam seepy question.
As shown in Figure 4, for the off-lying sea of the present invention without another embodiment of shielding steel cofferdam Longkou flow-guiding construction method, the present embodiment have employed gate method and forms water conservancy diversion and cross aquaporin.Gate method off-lying sea is without screening the optimization carried out on flow-guiding construction method basis, steel cofferdam Longkou in upper method off-lying sea of pulling out without shielding steel cofferdam Longkou flow-guiding construction method, it is specially, upper pull out described steel sheet pile 1 before, first will on the steel sheet pile 1 that pulls out block from bottom, after described steel sheet pile pulls out, form bar gate type water conservancy diversion and cross aquaporin 2.
Method off-lying sea is pulled out without shielding steel cofferdam Longkou flow-guiding construction method without shielding steel cofferdam Longkou flow-guiding construction method in gate method off-lying sea on common, have an advantage in that, it is possible to avoid the method for pulling out to throw rubble when construction due to diversion section, after pulling out on completely, rubble landing, the secondary inserted to play caused difficulty.Gate method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method due to upper pull out steel sheet pile before first to will on the steel sheet pile that pulls out blocked from bottom, the bottom of such steel sheet pile has been left in seabed, to on the steel sheet pile that pulls out reset time, need not again to inserted to play in the silt in seabed, having only to after being resetted by steel sheet pile, the part original with bottom carries out welding.After steel sheet pile cutting, steel sheet pile bearing capacity is still in scope of design.Diversion section steel sheet pile has carried out consolidation process, and safety coefficient is high.
Embodiment described above is only the preferred embodiment lifted for absolutely proving the present invention, and protection scope of the present invention is not limited to this.Equivalent replacement that those skilled in the art make on basis of the present invention or conversion, all within protection scope of the present invention.Protection scope of the present invention is as the criterion with claims.
Claims (10)
1. one kind is pulled out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method, it is characterised in that including:
A, the low tide period pull out on interval, side, steel cofferdam Longkou a part of steel sheet pile formed water conservancy diversion cross aquaporin；
B, at Longkou place inserted to play steel sheet pile, until completing the closure of Longkou；
C, by the steel sheet pile inserted to play pulled out to design altitude to reset；
D, reset steel sheet pile between inserted to play compartment stake, and formed compartment in jackstone, water conservancy diversion is crossed aquaporin and blocks, complete steel cofferdam Longkou closure construction.
2. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 1, it is characterised in that in described step A, on pull out described steel sheet pile before, first will on the steel sheet pile that pulls out block from bottom, after described steel sheet pile pulls out, form bar gate type water conservancy diversion and cross aquaporin.
3. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 1 or 2, it is characterised in that described water conservancy diversion is crossed the width of aquaporin and is not less than 8 meters.
4. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 1 or 2, it is characterised in that in described step A, the height that steel sheet pile pulls out is 2.5-3.5 rice.
5. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 4, it is characterised in that in described step A, the height that steel sheet pile pulls out is 3 meters.
6. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 1 or 2, it is characterised in that in described step A, when a part of steel sheet pile is pulled out at interval, on a steel sheet pile, pull out a steel sheet pile.
7. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 1 or 2, it is characterised in that in described step A, before upper group of described steel sheet pile, first steady brace is set in the middle part of described steel sheet pile.
8. on as claimed in claim 1 or 2, pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method, it is characterized in that, in described step B, arrange steel sheet pile in Longkou section inserted to play two and pull bar is installed, in the compartment formed between backward two the row's steel sheet piles of pull bar installation, jackstone and hydraulic reclamation are husky, complete the closure of Longkou.
9. on as claimed in claim 1 or 2, pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method, it is characterized in that, after described step A, the upper steel sheet pile pulled out offers bonnet lock hole with corresponding section, steel sheet pile top, both sides, by snap close by adjacent steel sheet pile docking.
10. pull out method off-lying sea without shielding steel cofferdam Longkou flow-guiding construction method on as claimed in claim 9, it is characterised in that after described step C, sealing member is set at described bonnet lock hole place and is sealed by described bonnet lock hole.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610075497.2A CN105714837B (en) | 2016-02-03 | 2016-02-03 | Method off-lying sea is pulled out in one kind without shielding steel cofferdam Longkou flow-guiding construction method |
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| CN201610075497.2A CN105714837B (en) | 2016-02-03 | 2016-02-03 | Method off-lying sea is pulled out in one kind without shielding steel cofferdam Longkou flow-guiding construction method |
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| CN105714837A true CN105714837A (en) | 2016-06-29 |
| CN105714837B CN105714837B (en) | 2017-10-20 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61286417A (en) * | 1985-06-12 | 1986-12-17 | Nippon Kokan Kk <Nkk> | Cofferdam structure |
| CN101748744A (en) * | 2008-12-19 | 2010-06-23 | 四川公路桥梁建设集团有限公司 | Asynchronous sinking construction method for large bridge foundation separation type steel cofferdam |
| CN101892632A (en) * | 2009-05-19 | 2010-11-24 | 上海市基础工程公司 | Construction method of structural system of river under no-cutoff working condition |
| CN104452785A (en) * | 2014-11-06 | 2015-03-25 | 中铁十五局集团有限公司 | Larsen steel sheet pile cofferdam folding construction method |
| CN204356792U (en) * | 2014-12-26 | 2015-05-27 | 长安大学 | The construction equipment of cofferdam, a kind of river water conservancy diversion |
| CN104805854A (en) * | 2015-04-29 | 2015-07-29 | 中铁四局集团第二工程有限公司 | Method for constructing deep-water ultra-long steel plate pile cofferdam in tide environment |
-
2016
- 2016-02-03 CN CN201610075497.2A patent/CN105714837B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61286417A (en) * | 1985-06-12 | 1986-12-17 | Nippon Kokan Kk <Nkk> | Cofferdam structure |
| CN101748744A (en) * | 2008-12-19 | 2010-06-23 | 四川公路桥梁建设集团有限公司 | Asynchronous sinking construction method for large bridge foundation separation type steel cofferdam |
| CN101892632A (en) * | 2009-05-19 | 2010-11-24 | 上海市基础工程公司 | Construction method of structural system of river under no-cutoff working condition |
| CN104452785A (en) * | 2014-11-06 | 2015-03-25 | 中铁十五局集团有限公司 | Larsen steel sheet pile cofferdam folding construction method |
| CN204356792U (en) * | 2014-12-26 | 2015-05-27 | 长安大学 | The construction equipment of cofferdam, a kind of river water conservancy diversion |
| CN104805854A (en) * | 2015-04-29 | 2015-07-29 | 中铁四局集团第二工程有限公司 | Method for constructing deep-water ultra-long steel plate pile cofferdam in tide environment |
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| CN105714837B (en) | 2017-10-20 |
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Effective date of registration: 20230904 Address after: No. 139, Pingjiang Road, Xuhui District, Shanghai 200030 Patentee after: CCCC THIRD HARBOR ENGINEERING Co.,Ltd. Patentee after: NINGBO BRANCH, CCCC NO.3 HARBOR ENGINEERING CO.,LTD. Address before: No.462, Yanjiang East Road, Zhenhai District, Ningbo, Zhejiang 315000 Patentee before: NINGBO BRANCH, CCCC NO.3 HARBOR ENGINEERING CO.,LTD. |