CN111119212A - Construction method for sinking double-wall steel cofferdam under deep clay layer condition - Google Patents
Construction method for sinking double-wall steel cofferdam under deep clay layer condition Download PDFInfo
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- CN111119212A CN111119212A CN201911308953.3A CN201911308953A CN111119212A CN 111119212 A CN111119212 A CN 111119212A CN 201911308953 A CN201911308953 A CN 201911308953A CN 111119212 A CN111119212 A CN 111119212A
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- cofferdam
- loosening
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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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Abstract
The invention discloses a construction method for sinking a double-wall steel cofferdam under the condition of a deep clay layer, and relates to the technical field of bridge foundation construction. According to the method, according to the geological condition of the riverbed, loosening and twisting of a cohesive soil layer at the lower part of the cofferdam are realized through a clay loosening and twisting device arranged on a central platform, the cleaning of the riverbed at the bottom of the cofferdam is realized through a mud suction device fixed on the wall of the cofferdam, and the smooth lowering of the cofferdam is realized through adjusting the water level of a cofferdam compartment. The method applies a new cohesive soil riverbed scarfing system, realizes the accurate cleaning of the viscous thick covering layer at the bottom of the weir and the rapid construction of the descending of the cofferdam, effectively improves the construction efficiency and reduces the construction cost.
Description
Technical Field
The invention relates to the technical field of bridge foundation construction, in particular to a sinking construction method of a double-wall steel cofferdam under the condition of a deep clay layer.
Background
At present, the construction of a double-wall steel cofferdam with a riverbed in cohesive soil geology generally adopts a construction method of pre-grooving and then putting. The construction method needs to form the groove in advance, the desilting work is carried out again when the cofferdam is lowered, the construction quality in the deep clay layer is difficult to guarantee, the construction period is long, the construction efficiency is low, and the construction cost is high.
Disclosure of Invention
In order to overcome the technical defects in the prior art, the invention provides a construction method for sinking a double-wall steel cofferdam under the condition of a deep clay layer, and the technical problems are solved.
The invention realizes the aim through the following technical scheme, and provides a sinking construction method of a double-wall steel cofferdam under the condition of a deep clay layer, which comprises the following construction steps:
s1: and a loose-twisting device mounting platform is arranged at the center of the cofferdam.
S2: the platform is provided with a loosening and twisting device which comprises a rotary base, a control system, a motor, a power arm, a cutter head and a balance weight.
S3: and (4) installing a cofferdam lowering guide device, assembling the cofferdam and positioning retesting.
S4: and a mud suction device is arranged on the inner wall of the cofferdam.
S5: and starting the loosening and twisting device, adjusting the power arm to a proper angle and position, clockwise rotating the power arm, and cutting the loosening and twisting soil layer in a layered mode.
S6: and starting the mud suction device to suck the loosened mud to form a U-shaped groove.
S7: and (4) according to the grooving progress, gradually filling water into the cofferdam and putting down the cofferdam.
S8: and clearing the bottom to a preset elevation, withdrawing the loosening and twisting arm, lowering the cofferdam to a designed elevation, and dismantling the loosening and twisting device and the platform.
S9: pouring concrete, and cofferdam sealing.
S10: and after the strength of the groove sealing concrete meets the requirement, water pumping and inner support installation are carried out in the cofferdam to form a dry operation condition.
In the above construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer, in step S1, the loose twisting device mounting platform uses the temporary steel pipe pile as a foundation, the steel pipes are welded by section steel to form a stable structure, and the upper part is provided with the distribution beam and the steel panel, which is a 6 × 6m square platform.
In the above construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer, in the step S2, the loosening and twisting device can realize 360-degree full rotation operation through the rotation base, the cutting position of the cutter head is controlled through the working radius and the depression angle of the telescopic power arm, and the loosening and twisting of the river bed is realized by the cutter head in a rotation cutting mode.
In the above construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer, in step S4, the pump pipe is installed along the inner wall of the cofferdam, and suction of silt at different positions is realized by adjusting the length of the pump pipe.
In the above construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer, in the step S7, the lowering depth of the double-wall steel cofferdam is controlled by the water filling amount, and the distance between the cofferdam bottom and the river bed is kept above H.
In the step S9, the pouring requirement of the groove sealing concrete is that the concrete conduit is lowered along the cofferdam wall, the first pouring amount of the concrete meets the requirement that the conduit is buried for the first time to a depth of more than 1.0m, and finally the concrete is poured to the bottom elevation of the bearing platform, so that the water stop effect of the groove sealing concrete is ensured.
Generally, compared with the prior art, the technical scheme of the invention can achieve the following beneficial effects: the invention relates to a construction method for sinking a double-wall steel cofferdam under the condition of a deep clay layer. The riverbed grooving and the cofferdam lowering are carried out synchronously, so that the risks of groove wall collapse and groove bottom siltation can be avoided, and the grooving and groove sealing quality is effectively guaranteed. The construction method simplifies the construction process of the deep-water foundation of the bridge under the specific geological condition, effectively shortens the construction period and reduces the construction cost.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings, in which:
FIG. 1 is a flow chart of a construction method for sinking a double-wall steel cofferdam under the condition of a deep clay layer;
FIG. 2 is a schematic diagram of the sinking construction of the double-wall steel cofferdam used under the condition of the deep clay layer;
in the figure: the method comprises the following steps of 1-loosening and twisting device installation platform, 2-rotating base, 3-control system, 4-power arm, 5-tool bit, 6-mud suction device, 7-double-wall steel cofferdam and 8-guiding device.
Detailed Description
Referring to fig. 1-2, a sinking construction method of a double-wall steel cofferdam under a deep clay layer condition includes the following steps:
the method comprises the following steps: and inserting and driving steel pipe piles in the center area of the cofferdam, and welding the steel pipe piles by using section steel to form a stable structure. And laying the section steel and the steel plate to form the loose twisting device mounting platform 1.
Step two, a loosening and twisting device is installed on the platform and comprises a rotary base 2, an operation system 3, a motor, a power arm 4, a cutter head 5 and a balance weight, the loosening and twisting device has the technical standard that the axis of the ① rotary base 2 is coincident with the center of the cofferdam, 360-degree rotation can be achieved, the maximum extension radius and the angle of the ② power arm 4 meet the grooving requirements, and the ③ cutter head 5 is of a conical structure and cuts a loosening and twisting riverbed through rotation.
Step three: inserting and driving the steel pipe piles, installing positioning wedge blocks on the side walls of the steel pipes, forming six groups of positioning and lowering guide devices 8 at different positions outside the cofferdam, and completing the assembly of the cofferdam by adopting a floating assembly mode; and (5) positioning and retesting, and controlling the deviation within 5 cm.
Step four: and a mud suction device 6 is arranged on the inner wall of the cofferdam.
Step five: and starting the loosening and twisting device, adjusting the power arm 4 to a proper angle and position, clockwise rotating the power arm 4, and cutting the loosening and twisting soil layer in a layering manner.
Step six: and starting the mud suction device 6 to suck and remove the loosened mud to form a U-shaped groove.
Step seven: according to the grooving progress, the cofferdam is gradually filled with water and is transferred, the depth of the double-wall steel cofferdam 7 is controlled by the water filling amount, and the distance between the cofferdam bottom and the riverbed is kept over H.
Step eight: and clearing the bottom to a preset elevation, withdrawing the loosening and twisting arm, lowering the cofferdam to a designed elevation, and dismantling the loosening and twisting device and the platform.
Step nine: and (3) placing the concrete guide pipes along the cofferdam wall, wherein the first concrete pouring amount meets the requirement that the first embedding depth of the guide pipes is more than 1.0m, and finally pouring the concrete to the elevation of the bottom of the bearing platform to ensure the water stopping effect of the groove sealing concrete.
Step ten: and after the strength of the groove sealing concrete meets the requirement, water pumping and inner support installation are carried out in the cofferdam to form a dry operation condition.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (6)
1. The sinking construction method of the double-wall steel cofferdam under the condition of the deep clay layer is characterized by comprising the following steps: the construction method comprises the following construction steps:
s1: a loose-twisting device mounting platform (1) is arranged at the center of the cofferdam;
s2: the platform is provided with a loosening and twisting device which comprises a rotary base (2), an operation system (3), a motor, a power arm (4), a tool bit (5) and a balance weight;
s3: installing a cofferdam lowering guide device (8), assembling the cofferdam, and positioning and retesting;
s4: a mud suction device (6) is arranged on the inner wall of the cofferdam;
s5: starting the loosening and twisting device, adjusting the power arm (4) to a proper angle and position, rotating the power arm (4) clockwise, and cutting a loosening and twisting soil layer in a layered mode;
s6: starting a mud suction device (6) to suck and remove the loose and twisted mud to form a U-shaped groove;
s7: according to the grooving progress, the cofferdam is gradually filled with water and put down;
s8: clearing the bottom to a preset elevation, withdrawing the loosening and twisting arm, lowering the cofferdam to a designed elevation, and dismantling the loosening and twisting device and the platform;
s9: pouring concrete, and cofferdam sealing;
s10: and after the strength of the groove sealing concrete meets the requirement, water pumping and inner support installation are carried out in the cofferdam to form a dry operation condition.
2. A construction method for sinking of a double-walled steel cofferdam (7) under deep clay layer conditions according to claim 1, characterized in that: in the step S1, the loosening and twisting device mounting platform (1) uses temporary steel pipe piles as a foundation, steel pipes are welded by section steel to form a stable structure, and a distribution beam and a steel panel are mounted on the upper portion of the loosening and twisting device mounting platform, and the loosening and twisting device mounting platform is a 6 × 6m square platform.
3. The construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer as claimed in claim 1, wherein: in the step S2, the loosening and twisting device can realize 360-degree full-rotation operation through the rotation base (2), the cutting position of the cutter head (5) is controlled through the working radius and the depression angle of the telescopic power arm (4), and the cutter head (5) realizes loosening and twisting of the river bed in a rotation cutting mode.
4. The construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer as claimed in claim 1, wherein: and in the step S4, the pump pipe is arranged along the inner wall of the cofferdam, and the suction of silt at different positions is realized by adjusting the length of the pump pipe.
5. The construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer as claimed in claim 1, wherein: and in the step S7, the lowering depth of the double-wall steel cofferdam (7) is controlled by the water filling amount, and the distance between the cofferdam bottom and the river bed is kept above H.
6. The construction method for sinking the double-wall steel cofferdam under the condition of the deep clay layer as claimed in claim 1, wherein: the pouring requirement of the groove sealing concrete in the step S9 is that the concrete guide pipe is placed down along the cofferdam wall, the first pouring amount of the concrete meets the requirement that the first embedding depth of the guide pipe is more than 1.0m, and finally the concrete is poured to the elevation of the bottom of the bearing platform, so that the water stopping effect of the groove sealing concrete is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201911308953.3A CN111119212A (en) | 2019-12-18 | 2019-12-18 | Construction method for sinking double-wall steel cofferdam under deep clay layer condition |
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| CN201911308953.3A CN111119212A (en) | 2019-12-18 | 2019-12-18 | Construction method for sinking double-wall steel cofferdam under deep clay layer condition |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0718668A (en) * | 1993-06-29 | 1995-01-20 | Kumagai Gumi Co Ltd | Temporary shutoff method with steel pipe sheet pile or steel sheet pile |
| CN102425183A (en) * | 2011-12-12 | 2012-04-25 | 中交二航局第四工程有限公司 | Sludge suction method capable of accelerating sinking speed of steel cofferdam assembly |
| CN107059900A (en) * | 2017-03-23 | 2017-08-18 | 中建三局基础设施工程有限公司 | The construction method that a kind of Double-wall sin-gle-image radiography quickly sinks in sand-pebble layer |
| CN107869144A (en) * | 2017-11-17 | 2018-04-03 | 中铁二十二局集团第四工程有限公司 | A kind of pre- slotting ring seal Double-Wall Steel Boxed Cofferdam deep water foundation comprehensive construction method |
| CN108179759A (en) * | 2017-12-29 | 2018-06-19 | 重庆华力建设有限公司 | The underwater drill core slotting of driftway is without bottom sealing method |
| CN108442394A (en) * | 2018-03-19 | 2018-08-24 | 中建三局基础设施建设投资有限公司 | A kind of novel double-wall steel boxed cofferdam and construction method |
| CN109024638A (en) * | 2018-08-17 | 2018-12-18 | 中铁八局集团有限公司 | The hardened stiff plastic argillic horizon excavation construction method of deep water in a kind of steel cofferdam |
| CN110055991A (en) * | 2019-05-30 | 2019-07-26 | 安徽省交通控股集团有限公司 | A kind of two-wall hollow well foundation and its sinking construction method |
-
2019
- 2019-12-18 CN CN201911308953.3A patent/CN111119212A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0718668A (en) * | 1993-06-29 | 1995-01-20 | Kumagai Gumi Co Ltd | Temporary shutoff method with steel pipe sheet pile or steel sheet pile |
| CN102425183A (en) * | 2011-12-12 | 2012-04-25 | 中交二航局第四工程有限公司 | Sludge suction method capable of accelerating sinking speed of steel cofferdam assembly |
| CN107059900A (en) * | 2017-03-23 | 2017-08-18 | 中建三局基础设施工程有限公司 | The construction method that a kind of Double-wall sin-gle-image radiography quickly sinks in sand-pebble layer |
| CN107869144A (en) * | 2017-11-17 | 2018-04-03 | 中铁二十二局集团第四工程有限公司 | A kind of pre- slotting ring seal Double-Wall Steel Boxed Cofferdam deep water foundation comprehensive construction method |
| CN108179759A (en) * | 2017-12-29 | 2018-06-19 | 重庆华力建设有限公司 | The underwater drill core slotting of driftway is without bottom sealing method |
| CN108442394A (en) * | 2018-03-19 | 2018-08-24 | 中建三局基础设施建设投资有限公司 | A kind of novel double-wall steel boxed cofferdam and construction method |
| CN109024638A (en) * | 2018-08-17 | 2018-12-18 | 中铁八局集团有限公司 | The hardened stiff plastic argillic horizon excavation construction method of deep water in a kind of steel cofferdam |
| CN110055991A (en) * | 2019-05-30 | 2019-07-26 | 安徽省交通控股集团有限公司 | A kind of two-wall hollow well foundation and its sinking construction method |
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Application publication date: 20200508 |