CN112962641A - Construction method for dismantling riverbank cofferdam structure - Google Patents
Construction method for dismantling riverbank cofferdam structure Download PDFInfo
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- CN112962641A CN112962641A CN202110152836.3A CN202110152836A CN112962641A CN 112962641 A CN112962641 A CN 112962641A CN 202110152836 A CN202110152836 A CN 202110152836A CN 112962641 A CN112962641 A CN 112962641A
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- support
- cofferdam
- foundation pit
- continuous wall
- outer layer
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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
Abstract
The invention discloses a construction method for dismantling a bank cofferdam structure, which is used for dismantling the bank cofferdam structure, wherein the bank cofferdam structure comprises a foundation pit, a first support, a second support, a third support, a steel pipe pile, a plain concrete continuous wall and an outer cofferdam layer which are sequentially arranged from inside to outside; the construction method for dismantling the bank cofferdam structure comprises the following steps: s1, removing the third support; s2, removing the second support; s3, irrigating the foundation pit, so that the water level height in the foundation pit is flush with the water level line outside the cofferdam outer layer; s4, removing the plain concrete continuous wall and the outer layer of the cofferdam; s5, removing the first support; and S6, removing the steel pipe pile. According to the invention, the earth sand backfill in the prior art is changed into the irrigation backfill, and by utilizing the advantages of the surrounding environment, when the irrigation backfill reaches a certain height, the pressure value of the river outside the cofferdam and the backfill inside the cofferdam is stabilized, and then the dismantling construction is carried out on the bank cofferdam structure, so that the advantages of high efficiency, low cost and the like are achieved.
Description
Technical Field
The invention relates to a cofferdam construction method, in particular to a construction method for dismantling a bank cofferdam structure.
Background
The cofferdam is a temporary enclosure structure constructed for constructing permanent water conservancy facilities in the water conservancy project construction, so that various facilities such as drainage in the cofferdam, foundation pit excavation, unit or ship lock installation in a hydropower station and the like can be conveniently arranged, and water and soil can be prevented from entering the construction position of a building.
The cofferdam is generally dismantled after being used up, and a temporary supporting structure in the cofferdam needs to be dismantled while the cofferdam is dismantled, and a concrete support, a steel pipe pile, a concrete continuous wall and the like are covered. In the existing river engineering, sand or earthwork is usually filled into a foundation pit in order to fill a temporary supporting structure in the cofferdam, so that the pressure difference inside and outside the cofferdam is reduced, and the cofferdam is prevented from collapsing. And after the cofferdam is removed, excavating filled earthwork or silt. The existing cofferdam demolition method has the defects of large backfilling square amount, long time, high cost, low engineering efficiency and the like.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a construction method for dismantling a bank cofferdam structure, which can efficiently dismantle the bank cofferdam structure.
The construction method for dismantling the bank cofferdam structure is used for dismantling the bank cofferdam structure, and the bank cofferdam structure comprises a foundation pit, a concrete support, a steel pipe pile, a plain concrete continuous wall and an outer cofferdam layer which are sequentially arranged from inside to outside; the concrete supports comprise a first support, a second support and a third support which are horizontal from top to bottom and arranged on the side part of the steel pipe pile at intervals, and the top surface of the first support is flush with the top surface of the plain concrete continuous wall; the construction method for dismantling the bank cofferdam structure comprises the following steps:
s1, removing the third support;
s2, removing the second support;
s3, pouring water into the foundation pit to enable the water level height in the foundation pit to be flush with the water level line outside the cofferdam outer layer;
s4, removing the plain concrete continuous wall and the outer layer of the cofferdam;
s5, removing the first support;
and S6, dismantling the steel pipe pile.
The construction method for dismantling the bank cofferdam structure according to the embodiment of the invention at least has the following technical effects: according to the invention, the earth and sand backfilling in the prior art is changed into irrigation backfilling, and the advantages of the surrounding environment are utilized, so that material resources are saved. When the irrigation backfill reaches a certain height, the pressure values of the river water outside the cofferdam and the backfill water inside the cofferdam are stable, and then the construction of dismantling the bank cofferdam structure is carried out, so that the method has the advantages of short time, high efficiency, low cost and the like.
According to some embodiments of the invention, step S4 includes:
s41, firstly, excavating the outer layer of the cofferdam for the first time, and then breaking the plain concrete continuous wall for the first time; the top surface of the plain concrete continuous wall after the first breaking is flush with the top surface of the outer layer of the cofferdam after the first excavation;
s42, firstly, carrying out secondary excavation on the outer layer of the cofferdam until the outer layer of the cofferdam is completely excavated so as to expose a mud layer below the outer layer of the cofferdam and simultaneously carrying out secondary excavation on the plain concrete continuous wall; and the top surface of the plain concrete continuous wall after the second breaking is flush with the top surface of the soil layer.
According to some embodiments of the invention, the outer layer of the cofferdam is excavated from the middle position to both sides of the outer layer of the cofferdam.
According to some embodiments of the invention, after step S4 and before step S5, a clamshell dredger is used to perform a first dredging and a second dredging on the pipe joint foundation trench, the plain concrete continuous wall is broken while performing the first dredging and the breaking depth is the same as the first dredging depth, and the plain concrete continuous wall is broken while performing the second dredging and the breaking depth is the same as the second dredging depth; and finely digging the pipe joint base groove until the design elevation is met, and simultaneously completely breaking the plain concrete continuous wall.
According to some embodiments of the invention, the depth of the first dredging is less than the depth of the second dredging.
According to some embodiments of the invention, the debris from the excavation, the earth and the sludge from the dredging are transported by self-propelled barge.
According to some embodiments of the invention, step S1 includes:
s11, pouring water into the foundation pit, wherein the height of the water level in the foundation pit after water pouring is lower than the bottom surface of the third support;
s12, hoisting and fixing the third support and the second support;
s13, carrying out segmentation marking on the third support;
s14, removing the third support in a segmented manner;
and S15, transporting the removed third support out of the foundation pit.
According to some embodiments of the invention, step S2 includes:
s21, continuing to pour water into the foundation pit, wherein the height of the water level in the foundation pit after water pouring is lower than the bottom surface of the second support;
s22, hoisting and fixing the second support and the first support;
s23, carrying out segmentation marking on the second support;
s24, removing the second support in a segmented manner;
and S25, transporting the removed second support out of the foundation pit.
According to some embodiments of the invention, the bank cofferdam structure includes construction columns extending upwardly from the bottom of the foundation pit to connect the first, second and third supports; before step S1, the bottom of the construction column is cleaned of the super-filled concrete by a pneumatic pick, and after step S5, the construction column is segmented and cut.
According to some embodiments of the invention, in step S6, the steel pipe pile is cut in a segmented manner.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic illustration of a bank cofferdam structure to be dismantled;
FIG. 2 is a schematic diagram of water irrigation into a foundation pit when a third support is dismantled by the method for dismantling the bank cofferdam structure;
FIG. 3 is a schematic diagram of water irrigation into a foundation pit when a second support is dismantled by the method for dismantling the bank cofferdam structure;
FIG. 4 is a schematic diagram of water irrigation into a foundation pit when a first support is dismantled by the aid of the method for dismantling the bank cofferdam structure;
FIG. 5 is a flow chart of a construction method for dismantling a bank cofferdam structure according to the invention;
reference numerals: the construction method comprises the following steps of a foundation pit 101, a first support 102, a second support 103, a third support 104, a plain concrete continuous wall 105, a steel pipe pile 106, a bank cofferdam structure 107 and an excavator 108.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", and the like, indicate orientations and positional relationships based on the orientations and positional relationships shown in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1 to 5, the riverbank cofferdam structure includes a foundation pit 101, a concrete support, a steel pipe pile 106, a plain concrete continuous wall 105 and a cofferdam outer layer 107 which are sequentially arranged from inside to outside; the concrete supports comprise a first support 102, a second support 103 and a third support 104 which are horizontal from top to bottom and are arranged on the side part of the steel pipe pile 106 at intervals, and the top surface of the first support 102 is flush with the top surface of the plain concrete continuous wall 105; the construction method for dismantling the bank cofferdam structure comprises the following steps:
s1, removing the third support 104;
s2, removing the second support 103;
s3, pouring water into the foundation pit 101, and enabling the water level height in the foundation pit 101 to be flush with the water level line outside the bank cofferdam structure, so that the pressure difference between the inside and the outside of the bank cofferdam structure is kept balanced.
S4, removing the plain concrete continuous wall 105 and the outer layer 107 of the cofferdam;
s5, removing the first support 102;
and S6, removing the steel pipe pile 106.
The construction method for dismantling the bank cofferdam structure according to the embodiment of the invention at least has the following technical effects: according to the invention, the earth and sand backfilling in the prior art is changed into irrigation backfilling, and the advantages of the surrounding environment are utilized, so that material resources are saved. When the irrigation backfill reaches a certain height, the pressure values of the river water outside the cofferdam and the backfill water inside the cofferdam are stable, and then the construction of dismantling the bank cofferdam structure is carried out, so that the method has the advantages of short time, high efficiency, low cost and the like.
In some embodiments of the invention, step S4 includes:
s41, firstly, excavating the outer layer 107 of the cofferdam for the first time, and then breaking the plain concrete continuous wall 105 for the first time; the top surface of the plain concrete continuous wall 105 after the first breaking is flush with the top surface of the outer layer 107 of the cofferdam after the first excavation;
s42, firstly, carrying out secondary excavation on the outer layer 107 of the cofferdam until the outer layer 107 of the cofferdam is completely excavated to expose a mud layer below the outer layer 107 of the cofferdam, and then carrying out secondary excavation on the plain concrete continuous wall 105; the top surface of the plain concrete continuous wall 105 after the second breaking is flush with the top surface of the earth layer.
In some embodiments of the present invention, the outer cofferdam layer 107 is excavated from the middle of the outer cofferdam layer 107 to both sides.
In this embodiment, a first excavation is performed by constructing a bank cofferdam structure with an excavator 108, and the outer cofferdam layer 107 and the upper portion of the plain concrete continuous wall 105 are removed. And when the top surfaces of the residual cofferdam outer layer 107 and the plain concrete continuous wall 105 are 2-2.5 m higher than the water line, continuously removing the cofferdam outer layer 107 and the plain concrete continuous wall 105 by adopting a hook-type ship-loaded excavator 108.
In some embodiments of the present invention, after step S4 and before step S5, a clamshell dredge is used to perform a first dredging and a second dredging on the foundation trench of the pipe section, wherein the first dredging is performed while the plain concrete continuous wall 105 is being broken, and the breaking depth is consistent with the first dredging depth, and the second dredging is performed while the plain concrete continuous wall 105 is being broken, and the breaking depth is consistent with the second dredging depth; and finely digging the pipe joint base groove until the design elevation is met, and completely breaking the plain concrete continuous wall 105.
In some embodiments of the invention, the depth of the first dredging is less than the depth of the second dredging.
In some embodiments of the invention, debris from excavation, earth and sludge from dredging are transported by self-propelled barge.
In some embodiments of the invention, step S1 includes:
s11, pouring water into the foundation pit 101, wherein the height of the water level in the foundation pit 101 after water pouring is lower than the bottom surface of the third support 104;
s12, hoisting and fixing the third support 104 and the second support 103;
s13, marking the third support 104 in a segmented mode;
s14, removing the third support 104 in sections;
and S15, transporting the removed third support 104 out of the foundation pit 101.
In some embodiments of the invention, step S2 includes:
s21, continuing to fill water into the foundation pit 101, wherein the height of the water level in the foundation pit 101 after water filling is lower than the bottom surface of the second support 103;
s22, hoisting and fixing the second support 103 and the first support 102;
s23, marking the second support 103 in a segmented manner;
s24, removing the second support 103 in sections;
and S25, transporting the removed second support 103 out of the foundation pit 101.
In some embodiments of the invention, the bank cofferdam structure includes construction columns (not shown) extending upward from the bottom of the foundation pit 101 to connect the first support 102, the second support 103 and the third support 104; before step S1, the bottom of the construction column is cleaned of the super-filled concrete by a pneumatic pick, and after step S5, the construction column is segmented.
In some embodiments of the present invention, in step S6, the steel pipe pile 106 is cut in a segmented manner.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A construction method for dismantling a bank cofferdam structure is characterized by comprising the following steps: the construction method comprises the following steps of dismantling a bank cofferdam structure, wherein the bank cofferdam structure comprises a foundation pit, a concrete support, a steel pipe pile, a plain concrete continuous wall and a cofferdam outer layer which are sequentially arranged from inside to outside; the concrete supports comprise a first support, a second support and a third support which are horizontal from top to bottom and arranged on the side part of the steel pipe pile at intervals, and the top surface of the first support is flush with the top surface of the plain concrete continuous wall;
the construction method for dismantling the bank cofferdam structure comprises the following steps:
s1, removing the third support;
s2, removing the second support;
s3, pouring water into the foundation pit to enable the water level height in the foundation pit to be flush with the water level line outside the cofferdam outer layer;
s4, removing the plain concrete continuous wall and the outer layer of the cofferdam;
s5, removing the first support;
and S6, dismantling the steel pipe pile.
2. The method for demolishing a riverbank cofferdam structure according to claim 1, wherein the step S4 includes:
s41, firstly, excavating the outer layer of the cofferdam for the first time, and then breaking the plain concrete continuous wall for the first time; the top surface of the plain concrete continuous wall after the first breaking is flush with the top surface of the outer layer of the cofferdam after the first excavation;
s42, firstly, carrying out secondary excavation on the outer layer of the cofferdam until the outer layer of the cofferdam is completely excavated so as to expose a mud layer below the outer layer of the cofferdam and simultaneously carrying out secondary excavation on the plain concrete continuous wall; and the top surface of the plain concrete continuous wall after the second breaking is flush with the top surface of the soil layer.
3. The river bank cofferdam structure demolition construction method according to claim 2, characterized in that: and when the outer layer of the cofferdam is excavated, excavating from the middle position of the outer layer of the cofferdam to two sides.
4. The river bank cofferdam structure demolition construction method according to claim 2, characterized in that: after the step S4 and before the step S5, carrying out first dredging and second dredging on the pipe joint foundation trench by using a grab dredger, wherein the plain concrete continuous wall is broken while carrying out the first dredging, the breaking depth is consistent with the first dredging depth, and the plain concrete continuous wall is broken while carrying out the second dredging, and the breaking depth is consistent with the second dredging depth; and finely digging the pipe joint base groove until the design elevation is met, and simultaneously completely breaking the plain concrete continuous wall.
5. The riparian cofferdam structure demolition construction method according to claim 4, wherein: the depth of the first dredging is less than that of the second dredging.
6. The riparian cofferdam structure demolition construction method according to claim 4, wherein: the broken stones and the earthwork generated by excavation and the sludge generated by dredging are transported by the self-propelled barge.
7. The method for demolishing a riverbank cofferdam structure according to claim 1, wherein the step S1 includes:
s11, pouring water into the foundation pit, wherein the height of the water level in the foundation pit after water pouring is lower than the bottom surface of the third support;
s12, hoisting and fixing the third support and the second support;
s13, carrying out segmentation marking on the third support;
s14, removing the third support in a segmented manner;
and S15, transporting the removed third support out of the foundation pit.
8. The river bank cofferdam structure demolition construction method as claimed in claim 7, wherein: step S2 includes:
s21, continuing to pour water into the foundation pit, wherein the height of the water level in the foundation pit after water pouring is lower than the bottom surface of the second support;
s22, hoisting and fixing the second support and the first support;
s23, carrying out segmentation marking on the second support;
s24, removing the second support in a segmented manner;
and S25, transporting the removed second support out of the foundation pit.
9. The river bank cofferdam structure demolition construction method as claimed in claim 1, wherein: the bank cofferdam structure comprises constructional columns which extend upwards from the bottom of the foundation pit to connect the first support, the second support and the third support; before step S1, the bottom of the construction column is cleaned of the super-filled concrete by a pneumatic pick, and after step S5, the construction column is segmented and cut.
10. The river bank cofferdam structure demolition construction method as claimed in claim 1, wherein: in step S6, the steel pipe pile is cut in a segmented manner.
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| CN202110152836.3A CN112962641A (en) | 2021-02-04 | 2021-02-04 | Construction method for dismantling riverbank cofferdam structure |
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| CN202110152836.3A CN112962641A (en) | 2021-02-04 | 2021-02-04 | Construction method for dismantling riverbank cofferdam structure |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113882431A (en) * | 2021-10-12 | 2022-01-04 | 中交第四航务工程局有限公司 | Construction method for dismantling end cofferdam |
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| CN110565686A (en) * | 2019-08-28 | 2019-12-13 | 中铁大桥局集团有限公司 | Construction method for penetrating river channel under pipe gallery |
| CN111764417A (en) * | 2020-06-23 | 2020-10-13 | 中铁隧道集团三处有限公司 | Construction method for dismantling riverbank cofferdam structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113882431A (en) * | 2021-10-12 | 2022-01-04 | 中交第四航务工程局有限公司 | Construction method for dismantling end cofferdam |
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