CN115162366B - Construction method for pre-forming groove on pebble layer riverbed of deep water double-wall steel cofferdam and cleaning pebbles in groove - Google Patents
Construction method for pre-forming groove on pebble layer riverbed of deep water double-wall steel cofferdam and cleaning pebbles in groove Download PDFInfo
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- CN115162366B CN115162366B CN202210942697.9A CN202210942697A CN115162366B CN 115162366 B CN115162366 B CN 115162366B CN 202210942697 A CN202210942697 A CN 202210942697A CN 115162366 B CN115162366 B CN 115162366B
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- 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
- E02D17/06—Foundation trenches ditches or narrow shafts
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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
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/02—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches
- E02F5/04—Dredgers or soil-shifting machines for special purposes for digging trenches or ditches with digging screws
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02F—DREDGING; SOIL-SHIFTING
- E02F5/00—Dredgers or soil-shifting machines for special purposes
- E02F5/28—Dredgers or soil-shifting machines for special purposes for cleaning watercourses or other ways
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- Mining & Mineral Resources (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a construction method for pre-forming a groove on a pebble bed and cleaning pebbles in the groove in a deep double-wall steel cofferdam, wherein the groove is pre-formed on the pebble bed along the annular descending position of the double-wall steel cofferdam, the longitudinal section of the groove is rectangular, the unstable pebbles on two sides after forming the groove are blown into the groove through an air compressor, soil in the pebbles is sucked out through a mud aspirator, then the blown pebbles are dug out, concrete is poured into the groove after the double-wall steel cofferdam is descended into the groove, and the double-wall steel cofferdam is solidified with the riverbed through pouring concrete in the groove. The invention has the advantages of short construction period, safety, reliability, environment-friendly construction, economy, rationality and quality meeting the requirements, and belongs to the technical field of deep water foundation construction of large-scale bridge cofferdam construction.
Description
Technical Field
The invention relates to the technical field of deep water foundation construction of large bridge cofferdam construction, in particular to a construction method for pre-forming grooves on pebble bed riverbed of a deep water double-wall steel cofferdam and cleaning pebbles in the grooves.
Background
Along with the development of the building industry, large bridges such as river crossing, sea crossing and the like are visible everywhere, and a bridge foundation is generally constructed by adopting a cofferdam.
Compared with other cofferdam modes, the double-wall steel cofferdam has good water stopping performance, strength, rigidity and stability. However, the double-wall steel cofferdam has the defects of larger structural weight and size, longer prefabrication processing time and more difficult lowering, and particularly on pebble bed riverbed, pebbles are easy to loosen and fall off, so that the lowering difficulty is higher.
CN112281895a discloses a bearing platform structure for a sandy pebble stratum and a construction method, a dredger is utilized to dredge a riverbed on a water surface, the dredged riverbed is in an inverted trapezoid shape, the dredged riverbed comprises a riverbed slope surface and a riverbed bottom surface, a double-wall cofferdam is arranged on the riverbed bottom surface, a protective net for preventing sandy pebbles from rolling off is arranged on the riverbed slope surface, and two backfill layers and triangular supports are arranged between the riverbed slope surface and the wall body of the double-wall steel cofferdam, so that the strength of the outer side of the cofferdam is effectively enhanced. The construction method has the following defects: 1. the groove of holding steel cofferdam of excavation is circular pit, covers whole steel cofferdam, and the area of steel cofferdam surrounding parcel, excavation volume is big, and construction scale is great, and the excavation degree of difficulty is big. 2. In order to prevent pebbles from loosening and falling off, the slope surface of the river bed is directly dug to be inclined, so that the workload of excavation is increased. 3. And a protective net is paved on the slope surface of the river bed to prevent pebbles from loosening and falling off, so that the process is complex.
Disclosure of Invention
Aiming at the technical problems existing in the prior art, the invention aims at: the construction method for pre-forming grooves on pebble layer riverbed and cleaning pebbles in the grooves of the deep water double-wall steel cofferdam is small in excavation scale and effectively stabilizes side pebbles.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a deep water double-wall steel cofferdam is characterized in that a groove is preformed on a pebble layer riverbed and pebbles are cleaned in the groove, the groove is preformed on the pebble riverbed along the annular descending position of the double-wall steel cofferdam, the longitudinal section of the groove is rectangular, the unstable pebbles on two sides after being formed into the groove are blown into the groove through an air compressor due to the instability of the pebbles, soil in the pebbles is sucked out through a mud sucker, then the blown pebbles are dug out, concrete is poured into the groove after the double-wall steel cofferdam is descended into the groove, and the double-wall steel cofferdam is solidified with the riverbed through pouring concrete in the groove.
A construction method for pre-forming a groove on a pebble layer riverbed and cleaning pebbles in the groove by using a deepwater double-wall steel cofferdam comprises the following steps: (1) a rotary digging machine guiding groove; (2) blowing pebbles at two sides in the groove into the groove by an air compressor; (3) the mud sucker sucks out mud mixed in pebbles; (4) the long-arm digger cleans out the residual pebbles again; (5) lowering the double-wall steel cofferdam into place; and (6) pouring concrete for plugging in the groove.
In the step (1), a rotary drilling drill spacer Kong Tiaozuan is adopted, and the measuring and hole-by-hole positioning are carried out in the groove guiding process, so that the width and the depth of the groove are ensured.
In the step (2), the pebbles at two sides in the groove are blown into the groove by adopting an air compressor, so that a slope-placing pattern is formed.
In the step (3), the pebble layer contains a large amount of sediment, and the sediment mixed in the pebble is sucked out by adopting a mud suction device, so that only the pebble exists in the groove.
In the step (4), the blown pebbles after removing the sediment are directly cleaned by a long-arm excavator.
In step (5), the whole double-wall steel cofferdam is lowered into place in the preformed groove.
In the step (6), after the double-wall steel cofferdam is placed, concrete is poured on two outer sides of the side wall of the double-wall steel cofferdam, so that the double-wall steel cofferdam is stabilized, and meanwhile, leakage caused by internal and external water pressure difference after water in the double-wall steel cofferdam is discharged is avoided.
In the step (2), the operation parameter of the air compressor is 3m 3 /min。
In the step (6), the grooves are covered by concrete, the concrete is higher than the surface of the pebble river bed before excavation, and a slope structure is formed at the upper end of the concrete.
Stratum environment used in the present invention: the double-wall steel cofferdam is suitable for pebble layer structure, and has good overall stability and good water stopping effect.
The invention has the following advantages:
(1) Compared with steel sheet piles and steel pipe pile cofferdams, the construction in pebble beds is poor in water stopping effect generally, and poor in overall stability, especially in rivers with large flow velocity. Compared with steel sheet piles and steel pipe pile cofferdams, the double-wall steel cofferdam is better in water stopping performance, higher in structural rigidity and safer in construction.
(2) The spiral drill is adopted to form a groove on the riverbed, the depth of the groove formed by the riverbed is about 7 meters, the cofferdam is put in place and then is constructed according to an underwater concrete pouring process, the construction difficulty and risk are reduced by the groove forming process, and the height of the cofferdam is relatively controllable. After the steel cofferdam enters the pebble layer, the anti-scouring capability of the cofferdam is increased, the anti-overturning capability is increased, the structural safety is good, and the cofferdam has good stability.
(3) The transportation and assembly of the cofferdam do not need large-scale ship hanging equipment, so that the use of large-scale machinery such as a transportation ship is reduced, and good economic benefit is obtained.
(4) The preformed groove forms a ring shape, the excavation volume is smaller, and the excavation difficulty is small.
(5) By utilizing the characteristics of the pebble stratum, the air compressor is used for blowing the pebbles at two sides, so that unstable pebbles can be blown down, the condition that the pebbles at two sides can be stabilized without additional structures is achieved, meanwhile, the pebbles at the side surfaces are blown down instead of being directly excavated into a slope, the excavation operation is reduced, the construction difficulty is reduced, a slope releasing mode is formed, and the pebble stratum is more stable.
(6) The bottom of groove and side pebble layer all do not have not hard up, all pour the concrete at the two outsides of inslot double-walled steel cofferdam, are used for stabilizing double-walled steel cofferdam on the one hand, on the other hand can avoid discharging the back with double-walled steel cofferdam internal water, the seepage condition that appears because inside and outside water pressure difference.
(7) Short construction period, safety, reliability, environment-friendly construction, economy, rationality and quality meeting the requirements.
Drawings
FIG. 1 is a schematic diagram of the slot guiding sequence of a rotary excavator.
FIG. 2 is a cross-sectional view after the slots are preformed.
Fig. 3 is a schematic diagram of air compressor purge.
Fig. 4 is a schematic diagram of the operation of the suction dredge.
Fig. 5 is a schematic diagram of a long arm dredger dredging pebbles.
FIG. 6 is a schematic illustration of a concrete block after a double-walled steel cofferdam is placed into a trough.
In the figure, 1 is an air compressor, 2 is a mud suction device, 3 is a long-arm excavator, 4 is a plugging concrete, and 5 is a double-wall steel cofferdam wall.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The application scene of the invention is as follows: a construction method for preforming a groove in a pebble layer by using a double-wall steel cofferdam in a deepwater area of a large bridge foundation.
A deep water double-wall steel cofferdam is characterized in that a groove is preformed on a pebble layer riverbed and pebbles are cleaned in the groove, the groove is preformed on the pebble riverbed along the annular descending position of the double-wall steel cofferdam, the longitudinal section of the groove is rectangular, the unstable pebbles on two sides after being formed into the groove are blown into the groove through an air compressor due to the instability of the pebbles, soil in the pebbles is sucked out through a mud sucker, then the blown pebbles are dug out, concrete is poured into the groove after the double-wall steel cofferdam is descended into the groove, and the double-wall steel cofferdam is solidified with the riverbed through pouring concrete in the groove.
A construction method for pre-forming a groove on a pebble layer riverbed and cleaning pebbles in the groove by using a deepwater double-wall steel cofferdam specifically comprises the following steps: (1) a rotary digging machine guiding groove; (2) blowing pebbles at two sides in the groove into the groove by an air compressor; (3) the mud sucker sucks out mud mixed in pebbles; (4) the long-arm digger cleans out the residual pebbles again; (5) lowering the double-wall steel cofferdam into place; and (6) pouring concrete for plugging in the groove.
The pebble stratum is not required to be surrounded and pumped, and the pebble stratum is mechanically arranged on a steel temporary bridge.
In the step (1), a rotary drilling drill spacer Kong Tiaozuan is adopted, and the measuring and hole-by-hole positioning are carried out in the groove guiding process, so that the width and the depth of the groove are ensured. The slot-leading and hole-jumping sequence is carried out according to (1) to (d). a=2000 mm, b=300 mm, c=1000 mm.
In the step (2), the pebbles at two sides in the groove are blown into the groove by adopting an air compressor, so that a slope-placing pattern is formed, and the groove is more stable. In the step (2), the operation parameter of the air compressor is 3m 3 /min。
In the step (3), the pebble layer contains a large amount of sediment, and the sediment mixed in the pebble is sucked out by adopting a mud suction device, so that only the pebble exists in the groove.
In the step (4), the blown pebbles after removing the sediment are directly cleaned by a long-arm excavator. In the step, only the blown pebbles are cleaned away, and continuous digging is not needed.
In step (5), the whole double-wall steel cofferdam is lowered into place in the preformed groove.
In the step (6), after the double-wall steel cofferdam is placed, concrete is poured on two outer sides of the side wall of the double-wall steel cofferdam, so that the double-wall steel cofferdam is stabilized, and meanwhile, leakage caused by internal and external water pressure difference after water in the double-wall steel cofferdam is discharged is avoided. In the step (6), the grooves are covered by concrete, the concrete is higher than the surface of the pebble river bed before excavation, and a slope structure is formed at the upper end of the concrete.
The above examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be made in the equivalent manner, and the embodiments are included in the protection scope of the present invention.
Claims (9)
1. A construction method for removing pebbles in preformed grooves and grooves of a deep water double-wall steel cofferdam on pebble bed riverbed is characterized by comprising the following steps: a groove is preformed on a pebble river bed along the annular descending position of the double-wall steel cofferdam, the longitudinal section of the groove is rectangular, because pebbles on two sides after the groove is formed are unstable, the unstable pebbles are blown into the groove through an air compressor, soil in the pebbles is sucked out through a mud aspirator, then the blown pebbles are dug out, concrete is poured into the groove after the double-wall steel cofferdam is descended into the groove, and the double-wall steel cofferdam is solidified with the river bed in the groove through pouring the concrete; and blowing pebbles at two sides in the groove into the groove by adopting an air compressor to form a slope-placing pattern.
2. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as set forth in claim 1, which is characterized by comprising the following steps: (1) a rotary digging machine guiding groove; (2) blowing pebbles at two sides in the groove into the groove by an air compressor; (3) the mud sucker sucks out mud mixed in pebbles; (4) the long-arm digger cleans out the residual pebbles again; (5) lowering the double-wall steel cofferdam into place; and (6) pouring concrete for plugging in the groove.
3. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in the step (1), a rotary drilling drill spacer Kong Tiaozuan is adopted, and the measuring and hole-by-hole positioning are carried out in the groove guiding process, so that the width and the depth of the groove are ensured.
4. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in the step (3), the pebble layer contains a large amount of sediment, and the sediment mixed in the pebble is sucked out by adopting a mud suction device, so that only the pebble exists in the groove.
5. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in the step (4), the blown pebbles after removing the sediment are directly cleaned by a long-arm excavator.
6. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in step (5), the whole double-wall steel cofferdam is lowered into place in the preformed groove.
7. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in the step (6), after the double-wall steel cofferdam is placed, concrete is poured on two outer sides of the side wall of the double-wall steel cofferdam, so that the double-wall steel cofferdam is stabilized, and meanwhile, leakage caused by internal and external water pressure difference after water in the double-wall steel cofferdam is discharged is avoided.
8. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in the step (2), the operation parameter of the air compressor is 3m 3 /min。
9. The construction method for pre-forming grooves on pebble bed riverbed and cleaning pebbles in the grooves by using the deepwater double-wall steel cofferdam as claimed in claim 2, which is characterized in that: in the step (6), the grooves are covered by concrete, the concrete is higher than the surface of the pebble river bed before excavation, and a slope structure is formed at the upper end of the concrete.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210942697.9A CN115162366B (en) | 2022-08-05 | 2022-08-05 | Construction method for pre-forming groove on pebble layer riverbed of deep water double-wall steel cofferdam and cleaning pebbles in groove |
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| CN202210942697.9A CN115162366B (en) | 2022-08-05 | 2022-08-05 | Construction method for pre-forming groove on pebble layer riverbed of deep water double-wall steel cofferdam and cleaning pebbles in groove |
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| CN115162366A CN115162366A (en) | 2022-10-11 |
| CN115162366B true CN115162366B (en) | 2023-09-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000192469A (en) * | 1998-12-25 | 2000-07-11 | Kajima Corp | Cofferdam device used for double wall cofferdam construction method, and double wall cofferdam construction method |
| JP2000265474A (en) * | 1999-03-18 | 2000-09-26 | Maeda Corp | Temporary cofferdam constructing method for construction |
| CN111119213A (en) * | 2019-12-18 | 2020-05-08 | 中建三局基础设施建设投资有限公司 | Double-wall steel cofferdam with open edge feet and construction method thereof |
| DE202021103591U1 (en) * | 2020-07-09 | 2021-08-03 | China Railway Erju 1St Engineering Co.,Ltd | Reinforcement structure for a shallowly buried underground excavation tunnel top and a river bed bottom |
| CN113585302A (en) * | 2021-07-22 | 2021-11-02 | 中交第二航务工程局有限公司 | Construction method of bottom-sealing-free concrete double-wall steel cofferdam for deep water bare rock geology |
-
2022
- 2022-08-05 CN CN202210942697.9A patent/CN115162366B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000192469A (en) * | 1998-12-25 | 2000-07-11 | Kajima Corp | Cofferdam device used for double wall cofferdam construction method, and double wall cofferdam construction method |
| JP2000265474A (en) * | 1999-03-18 | 2000-09-26 | Maeda Corp | Temporary cofferdam constructing method for construction |
| CN111119213A (en) * | 2019-12-18 | 2020-05-08 | 中建三局基础设施建设投资有限公司 | Double-wall steel cofferdam with open edge feet and construction method thereof |
| DE202021103591U1 (en) * | 2020-07-09 | 2021-08-03 | China Railway Erju 1St Engineering Co.,Ltd | Reinforcement structure for a shallowly buried underground excavation tunnel top and a river bed bottom |
| CN113585302A (en) * | 2021-07-22 | 2021-11-02 | 中交第二航务工程局有限公司 | Construction method of bottom-sealing-free concrete double-wall steel cofferdam for deep water bare rock geology |
Non-Patent Citations (1)
| Title |
|---|
| 国土资源部人力资源开发中心 职业技能鉴定指导中心.《岩土工程地质工 初级 中级 高级》.地质出版社,1999,第53-54页. * |
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