CN112523236A - Combined cofferdam structure and construction method thereof - Google Patents
Combined cofferdam structure and construction method thereof Download PDFInfo
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- CN112523236A CN112523236A CN202011492630.7A CN202011492630A CN112523236A CN 112523236 A CN112523236 A CN 112523236A CN 202011492630 A CN202011492630 A CN 202011492630A CN 112523236 A CN112523236 A CN 112523236A
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- concrete
- cofferdam
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/34—Concrete or concrete-like piles cast in position ; Apparatus for making same
- E02D5/38—Concrete or concrete-like piles cast in position ; Apparatus for making same making by use of mould-pipes or other moulds
Abstract
The invention discloses a combined cofferdam structure, which is characterized in that: the cofferdam structure include that the round seals annular concrete interlock stake (1), concrete interlock stake (1) is buried underground in sandstone layer (2) and cobble soil layer (3), in the within range that concrete interlock stake (1) surround, the distribution of array has many bridge concrete pile (4), and these bridge concrete pile (4) also bury underground in sandstone layer (2) and cobble soil layer (3), the within range that concrete interlock stake (1) surround still is provided with back cover concrete (5), the top of back cover concrete (5) is provided with cushion cap (6) and pier (7), the top of concrete interlock stake (1) is provided with crown beam (8), is connected with double-walled steel cofferdam (10) through pre-buried steel member (9) on crown beam (8).
Description
Technical Field
The invention relates to the field of construction of constructional engineering, in particular to a combined cofferdam structure and a construction method of the combined cofferdam structure.
Background
The double-wall steel cofferdam is a common method for bridge foundation construction, and has better structural overall stability, high rigidity and strength, and superior resistance to water flow impact force and wave attack compared with other cofferdams, so the double-wall steel cofferdam is widely applied to bridge foundation construction in recent years. However, in the bridge construction process, geological environments are different, for example, in a pebble soil environment with frequently changed water level, the gradient of a river bed is too large, pebbles are uneven, the flow state of water flow is complex, the bottoms of pier bearing platforms of a plurality of bridges are positioned below the lowest water level and below a pebble soil layer, the whole foundation engineering quantity is large, the construction period is long, and a series of problems such as difficulty in lowering, poor structural stability, long construction period, high construction risk, high construction cost and the like can be faced by adopting the traditional double-wall steel cofferdam, so that a method or a device capable of solving the problems is needed at present.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, provides a combined cofferdam structure capable of realizing rapid and stable construction in a complex environment (pebble soil environment with variable seasonal water level), and also discloses a construction method of the cofferdam structure.
The technical solution of the invention is as follows: a combination weir structure which characterized in that: the cofferdam structure include that the round seals annular concrete interlock stake 1, concrete interlock stake 1 is buried underground in sandstone layer 2 and cobble soil layer 3, and in the within range that concrete interlock stake 1 surrounds, the distribution of array has many bridge concrete piles 4, and these bridge concrete piles 4 also bury underground in sandstone layer 2 and cobble soil layer 3, the within range that concrete interlock stake 1 surrounds still is provided with bottom sealing concrete 5, the top of bottom sealing concrete 5 is provided with cushion cap 6 and pier 7, the top of concrete interlock stake 1 is provided with crown beam 8, is connected with double-walled steel cofferdam 10 through pre-buried steel member 9 on the crown beam 8.
The concrete occlusive pile 1 is composed of plain concrete piles 11 and reinforced concrete piles 12 which are distributed at intervals, and the adjacent plain concrete piles 11 and the adjacent reinforced concrete piles 12 are mutually occluded.
The double-wall steel cofferdam 10 comprises an inner wall plate 13 and an outer wall plate 14, a plurality of pairs of horizontal ring plates 15 which are uniformly distributed in the longitudinal direction are further arranged between the inner wall plate 13 and the outer wall plate 14, a horizontal truss 16 is further arranged on the horizontal ring plates 15, a plurality of groups of web member mechanisms which are uniformly distributed in the circumferential direction are further arranged on the horizontal truss 16, each web member mechanism consists of a straight web member 17 and an inclined web member 18, a plurality of partition plates 19 which are uniformly distributed in the circumferential direction are further arranged between the inner wall plate 13 and the outer wall plate 14, the partition plates 19 divide an inner cavity of the double-wall steel cofferdam 10 into a plurality of independent cavities with equal size, and vertical reinforcing ribs and inclined rods 20 are further arranged at the bottom end of the double-wall steel cofferdam 10.
The embedded steel member 9 comprises vertical angle steels 21 arranged in pairs, horizontal angle steels 22 are connected between the vertical angle steels 21 in pairs, the vertical angle steels 22 are connected with binding steel bars 23 embedded in the crown beam 8, batten plates 24 are further arranged on the surface of the crown beam 8, and the batten plates 24 are welded at the joints of the vertical angle steels 21 and the horizontal angle steels 22
The construction method of the combined cofferdam structure is characterized in that: the method comprises the following steps in sequence:
in dry seasons, filling soil in a water area at the pier construction position to build an island, and forming an island building cofferdam after tamping;
pumping water in the island building cofferdam and preparing various drilled piles;
constructing a bridge pile foundation, burying a pile casing after a drilling machine is in place, drilling and forming holes after mud wall protection is finished, hoisting a reinforcement cage after the holes are cleaned, and pouring concrete to form a bridge concrete pile 4;
the construction method comprises the following steps that when the construction process of a bridge pile foundation is carried out, the construction of the concrete secant pile 1 is carried out, after a pile casing is placed down by using a rotary excavator, a plain concrete pile 11 is cast by using a rotary drill, after the plain concrete pile 11 reaches a certain strength, a reinforced concrete pile 12 is cast by using a percussion drill, and the two piles are mutually secant to form the concrete secant pile 1;
after the concrete secant pile 1 is constructed, excavating a foundation trench, processing a pile head of the secant pile, binding a binding steel bar 23 of the crown beam 8, installing a pre-embedded steel member 9 and pouring crown beam concrete, and completing construction of the crown beam 8;
installing a double-wall steel cofferdam 10, conveying the double-wall steel cofferdam 10 to the site after the block manufacturing of a prefabrication plant is finished, setting welding guide on an embedded steel member 9 after a measuring point lofting is carried out in a construction site, hoisting a first steel cofferdam block piece by a crawler crane to be lowered to a measuring point, carrying out spot welding with the embedded steel member 9, hoisting a second steel cofferdam block piece to be connected with the first block, aligning edge lines, correcting an inner wall plate 13, an outer wall plate 14 and a horizontal truss 16, carrying out welding and fixing, and sequentially hoisting, assembling and welding the rest blocks piece by piece until the double-wall steel cofferdam 10 is formed; after the welding of the double-wall steel cofferdam 10 is finished, a bleeding experiment is carried out to ensure that the welding of the cofferdam is dense and waterproof;
excavating a base layer, namely adopting a long-arm excavator and a crawler excavator to carry out matched construction, leveling the base in a cofferdam after excavating to a designed elevation, pouring bottom sealing concrete 5, and pouring the bottom sealing concrete 5 by adopting an automobile pump;
after the bottom sealing concrete 5 reaches a certain strength, erecting a bearing platform template, binding bearing platform reinforcing steel bars, pouring bearing platform concrete, and finishing maintenance;
erecting a pier body template, binding pier body steel bars, pouring pier body concrete, and finishing maintenance;
dismantling the cofferdam, firstly pre-hoisting and fixing the single steel cofferdam by a crane to prevent the steel cofferdam from toppling in the dismantling process, cutting and dismantling the steel cofferdam along the vertical welding seam position during the assembly of the steel cofferdam, then cutting off the connecting part of the bottom of the single steel cofferdam and the pre-buried steel member of the crown beam, finally hoisting the single steel cofferdam and transporting away, dismantling the steel cofferdam and the concrete secant pile 1 block by block in sequence, and keeping the concrete secant pile 1 in the soil layer;
and finishing construction.
Compared with the prior art, the invention has the following advantages:
the combined cofferdam structure disclosed by the invention provides a new arrangement thought of the double-wall steel cofferdam, and enriches the construction method of the double-wall steel cofferdam. The difficult problems of lowering and stabilizing the double-wall steel cofferdam under the condition of pebble soil are solved by arranging the concrete secant pile cofferdam; through setting up crown beam and pre-buried steel member concrete secant pile cofferdam (lower festival) and double-walled steel cofferdam (upper segment) firm connection, utilize and connect high double-walled steel cofferdam to form about the lower festival cofferdam and come to solve the difficult problem of foundation construction under the water level change in different seasons together, have good water-proof effects, guarantee that cushion cap and pier shaft are under the dry environment and go on. The cofferdam structure has the advantages of simple manufacturing process and low manufacturing cost, so the cofferdam structure has various advantages, is particularly suitable for popularization and application in the field, and has very wide market prospect.
Drawings
Fig. 1 is an elevation view of a combined cofferdam structure provided in an embodiment of the present invention.
Fig. 2 is a plan view of a concrete spud cofferdam of a composite cofferdam construction provided by an embodiment of the present invention.
Fig. 3 is a side view of a steel cofferdam of the combined cofferdam structure provided by the embodiment of the invention.
Fig. 4 is a sectional view of a steel cofferdam i-i of the combined cofferdam structure provided by the embodiment of the present invention.
Fig. 5 is an elevation view of an embedded steel member of the combined cofferdam structure provided by the embodiment of the invention.
Fig. 6 is a plan view of a crown beam binding reinforcement of the combined cofferdam structure provided by the embodiment of the invention.
Fig. 7 is a sectional view of a crown beam binding reinforcement bar ii-ii of the combined cofferdam structure provided by the embodiment of the invention.
Detailed Description
The following description will explain embodiments of the present invention with reference to the accompanying drawings. As shown in fig. 1 to 7: the utility model provides a combination cofferdam structure, it includes that the round seals annular concrete interlock stake 1, concrete interlock stake 1 buries underground in sandstone layer 2 and cobble soil layer 3, in the scope that concrete interlock stake 1 surrounds, the array distributes has many bridge concrete piles 4, and these bridge concrete piles 4 also bury underground in sandstone layer 2 and cobble soil layer 3, the scope that concrete interlock stake 1 surrounds still is provided with back cover concrete 5 to back cover concrete 5 is connected with all bridge concrete piles 4 simultaneously, the top of back cover concrete 5 is provided with cushion cap 6 and pier 7, the top of concrete interlock stake 1 is provided with crown beam 8, is connected with double-walled steel cofferdam 10 through pre-buried steel member 9 on the crown beam 8.
The concrete occlusive pile 1 is composed of plain concrete piles 11 and reinforced concrete piles 12 which are distributed at intervals, and the adjacent plain concrete piles 11 and the adjacent reinforced concrete piles 12 are mutually occluded.
The double-wall steel cofferdam 10 comprises an inner wall plate 13 and an outer wall plate 14, a plurality of pairs of horizontal ring plates 15 which are uniformly distributed in the longitudinal direction are further arranged between the inner wall plate 13 and the outer wall plate 14, a horizontal truss 16 is further arranged on the horizontal ring plates 15, a plurality of groups of web member mechanisms which are uniformly distributed in the circumferential direction are further arranged on the horizontal truss 16, each web member mechanism consists of a straight web member 17 and an inclined web member 18, a plurality of partition plates 19 which are uniformly distributed in the circumferential direction are further arranged between the inner wall plate 13 and the outer wall plate 14, the partition plates 19 divide an inner cavity of the double-wall steel cofferdam 10 into a plurality of independent cavities with equal size, and vertical reinforcing ribs and inclined rods 20 are further arranged at the bottom end of the double-wall steel cofferdam 10.
The embedded steel member 9 comprises vertical angle steels 21 arranged in pairs, horizontal angle steels 22 are connected between the vertical angle steels 21 in pairs, the vertical angle steels 22 are connected with binding steel bars 23 embedded in the crown beam 8, batten plates 24 are further arranged on the surface of the crown beam 8, and the batten plates 24 are welded at the joints of the vertical angle steels 21 and the horizontal angle steels 22
The construction method of the combined cofferdam structure comprises the following steps of:
in dry seasons, filling soil in a water area at the pier construction position to build an island, and forming an island building cofferdam after tamping;
pumping water in the island building cofferdam and preparing various drilled piles;
constructing a bridge pile foundation, burying a pile casing after a drilling machine is in place, drilling and forming holes after mud wall protection is finished, hoisting a reinforcement cage after the holes are cleaned, and pouring concrete to form a bridge concrete pile 4;
the construction method comprises the following steps that when the construction process of a bridge pile foundation is carried out, the construction of the concrete secant pile 1 is carried out, after a pile casing is placed down by using a rotary excavator, a plain concrete pile 11 is cast by using a rotary drill, after the plain concrete pile 11 reaches a certain strength, a reinforced concrete pile 12 is cast by using a percussion drill, and the two piles are mutually secant to form the concrete secant pile 1;
after the concrete secant pile 1 is constructed, excavating a foundation trench, processing a pile head of the secant pile, binding a binding steel bar 23 of the crown beam 8, installing a pre-embedded steel member 9 and pouring crown beam concrete, and completing construction of the crown beam 8;
installing a double-wall steel cofferdam 10, conveying the double-wall steel cofferdam 10 to the site after the block manufacturing of a prefabrication plant is finished, setting welding guide on an embedded steel member 9 after a measuring point lofting is carried out in a construction site, hoisting a first steel cofferdam block piece by a crawler crane to be lowered to a measuring point, carrying out spot welding with the embedded steel member 9, hoisting a second steel cofferdam block piece to be connected with the first block, aligning edge lines, correcting an inner wall plate 13, an outer wall plate 14 and a horizontal truss 16, carrying out welding and fixing, and sequentially hoisting, assembling and welding the rest blocks piece by piece until the double-wall steel cofferdam 10 is formed; after the welding of the double-wall steel cofferdam 10 is finished, a bleeding experiment is carried out to ensure that the welding of the cofferdam is dense and waterproof;
excavating a base layer, namely adopting a long-arm excavator and a crawler excavator to carry out matched construction, leveling the base in a cofferdam after excavating to a designed elevation, pouring bottom sealing concrete 5, and pouring the bottom sealing concrete 5 by adopting an automobile pump;
after the bottom sealing concrete 5 reaches a certain strength, erecting a bearing platform template, binding bearing platform reinforcing steel bars, pouring bearing platform concrete, and finishing maintenance;
erecting a pier body template, binding pier body steel bars, pouring pier body concrete, and finishing maintenance;
dismantling the cofferdam, firstly pre-hoisting and fixing the single steel cofferdam by a crane to prevent the steel cofferdam from toppling in the dismantling process, cutting and dismantling the steel cofferdam along the vertical welding seam position during the assembly of the steel cofferdam, then cutting off the connecting part of the bottom of the single steel cofferdam and the pre-buried steel member of the crown beam, finally hoisting the single steel cofferdam and transporting away, dismantling the steel cofferdam and the concrete secant pile 1 block by block in sequence, and keeping the concrete secant pile 1 in the soil layer;
and finishing construction.
Claims (5)
1. A combination weir structure which characterized in that: the cofferdam structure include that the round seals annular concrete interlock stake (1), concrete interlock stake (1) is buried underground in sandstone layer (2) and cobble soil layer (3), in the within range that concrete interlock stake (1) surround, the distribution of array has many bridge concrete pile (4), and these bridge concrete pile (4) also bury underground in sandstone layer (2) and cobble soil layer (3), the within range that concrete interlock stake (1) surround still is provided with back cover concrete (5), the top of back cover concrete (5) is provided with cushion cap (6) and pier (7), the top of concrete interlock stake (1) is provided with crown beam (8), is connected with double-walled steel cofferdam (10) through pre-buried steel member (9) on crown beam (8).
2. A composite cofferdam structure according to claim 1, characterized in that: the concrete occlusive pile (1) is composed of plain concrete piles (11) and reinforced concrete piles (12) which are distributed at intervals, and the adjacent plain concrete piles (11) and the adjacent reinforced concrete piles (12) are mutually occluded.
3. A composite cofferdam structure according to claim 1, characterized in that: the double-wall steel cofferdam (10) comprises an inner wall plate (13) and an outer wall plate (14), a plurality of pairs of horizontal ring plates (15) which are uniformly distributed in the longitudinal direction are further arranged between the inner wall plate (13) and the outer wall plate (14), a horizontal truss (16) is further arranged on the horizontal ring plates (15), a plurality of groups of web member mechanisms which are uniformly distributed in the circumferential direction are further arranged on the horizontal truss (16), each web member mechanism consists of a straight web member (17) and an inclined web member (18), a plurality of partition plates (19) which are uniformly distributed in the circumferential direction are further arranged between the inner wall plate (13) and the outer wall plate (14), the partition plates (19) divide an inner cavity of the double-wall steel cofferdam (10) into a plurality of independent cavities with equal size, and vertical reinforcing ribs and inclined rods (20) are further arranged at the bottom end of the double-wall steel cofferdam (10).
4. A composite cofferdam structure according to claim 1, characterized in that: pre-buried steel member (9) are connected with horizontal angle steel (22) including vertical angle steel (21) that set up in pairs between paired vertical angle steel (21), and vertical angle steel (22) still links to each other with pre-buried ligature reinforcing bar (23) in hat roof beam (8) simultaneously the surface of hat roof beam (8) still is provided with lacing plate (24), lacing plate (24) welding is in the junction of vertical angle steel (21) and horizontal angle steel (22).
5. A construction method of a combined cofferdam structure of claim 1, 2, 3 or 4, wherein: the method comprises the following steps in sequence:
in dry seasons, filling soil in a water area at the pier construction position to build an island, and forming an island building cofferdam after tamping;
pumping water in the island building cofferdam and preparing various drilled piles;
constructing a bridge pile foundation, burying a pile casing after a drilling machine is in place, drilling and forming holes after mud wall protection is finished, hoisting a reinforcement cage after the holes are cleaned, and pouring concrete to form a bridge concrete pile (4);
the construction method comprises the following steps that when the construction process of a bridge pile foundation is carried out, the construction of the concrete secant pile (1) is carried out, after a pile casing is placed down by using a rotary excavator, a plain concrete pile (11) is cast by using a rotary drill, after the plain concrete pile (11) reaches a certain strength, a reinforced concrete pile (12) is cast by using a percussion drill, and the two piles are mutually secant to form the concrete secant pile (1);
after the concrete secant pile (1) is constructed, excavating a foundation trench, processing binding reinforcing steel bars (23) of a top beam (8) after the pile head of the secant pile is bound, installing a pre-embedded steel member (9) and pouring top beam concrete to complete the construction of the top beam (8);
installing a double-wall steel cofferdam (10), transporting the double-wall steel cofferdam (10) to the site after the block manufacturing of a prefabricating plant is finished, after a measuring point lofting is carried out in a construction site, arranging welding guide on an embedded steel member (9), hoisting a first steel cofferdam block by a crawler crane to be lowered to the measuring point, carrying out spot welding with the embedded steel member (9), hoisting a second steel cofferdam block to be connected with the first block, aligning a margin line, correcting an inner wall plate (13), an outer wall plate (14) and a horizontal truss (16), carrying out welding fixation, and sequentially hoisting, assembling and welding the rest blocks one by one until the double-wall steel cofferdam (10) is formed; after the double-wall steel cofferdam (10) is welded and spliced, a bleeding experiment is carried out to ensure that the cofferdam is welded tightly and waterproof;
excavating a base layer, namely, adopting a long-arm excavator and a crawler excavator to carry out matched construction, leveling the base in a cofferdam after excavating to a designed elevation, pouring bottom sealing concrete (5), and pouring the bottom sealing concrete (5) by adopting an automobile pump;
after the bottom sealing concrete (5) reaches a certain strength, erecting a bearing platform template, binding bearing platform reinforcing steel bars, pouring bearing platform concrete, and finishing maintenance;
erecting a pier body template, binding pier body steel bars, pouring pier body concrete, and finishing maintenance;
dismantling the cofferdam, firstly pre-hoisting and fixing the single steel cofferdam by a crane to prevent the steel cofferdam from toppling in the dismantling process, cutting and dismantling the steel cofferdam along the vertical welding seam position during the assembly of the steel cofferdam, then cutting off the connecting part of the bottom of the single steel cofferdam and the pre-buried steel member of the crown beam, finally hoisting the single steel cofferdam and transporting away, dismantling the steel cofferdam blocks by blocks in sequence, and keeping the concrete secant pile (1) in the soil layer;
and finishing construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492630.7A CN112523236A (en) | 2020-12-17 | 2020-12-17 | Combined cofferdam structure and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492630.7A CN112523236A (en) | 2020-12-17 | 2020-12-17 | Combined cofferdam structure and construction method thereof |
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| CN112523236A true CN112523236A (en) | 2021-03-19 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202011492630.7A Pending CN112523236A (en) | 2020-12-17 | 2020-12-17 | Combined cofferdam structure and construction method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113463518A (en) * | 2021-06-21 | 2021-10-01 | 中铁十九局集团第五工程有限公司 | Anti-leakage construction method for soil between piles of existing bridge pile foundation |
| WO2023010631A1 (en) * | 2021-08-06 | 2023-02-09 | 中铁大桥勘测设计院集团有限公司 | Deepwater group pile foundation |
-
2020
- 2020-12-17 CN CN202011492630.7A patent/CN112523236A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113463518A (en) * | 2021-06-21 | 2021-10-01 | 中铁十九局集团第五工程有限公司 | Anti-leakage construction method for soil between piles of existing bridge pile foundation |
| CN113463518B (en) * | 2021-06-21 | 2022-12-09 | 中铁十九局集团第五工程有限公司 | Anti-leakage construction method for soil between piles of existing bridge pile foundation |
| WO2023010631A1 (en) * | 2021-08-06 | 2023-02-09 | 中铁大桥勘测设计院集团有限公司 | Deepwater group pile foundation |
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